Rotaviral Enteritis

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Classifications

Harrison's Part

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Pathophysiology

7

Host Glycan Attachment and Mature Villus Enterocyte Entry

Following luminal trypsin cleavage of the outer capsid spike protein VP4 into the distal lectin domain VP8* and membrane-penetration domain VP5*, rotavirus attaches to mature non-dividing enterocytes in the middle and tip of small intestinal villi and to enteroendocrine cells. VP8* binds host cell-surface sialoglycans and histo-blood group antigens (HBGAs) synthesized on the intestinal mucosa under the control of FUT2 (secretor status) in a P-genotype-specific manner (with predominant human P[8] and P[4] strains preferentially binding secretor HBGAs), followed by endocytic entry into the enterocyte cytoplasm.

enterocyte of epithelium of small intestine CL:1000334

FUT2 hgnc:4013

endocytosis involved in viral entry into host cell GO:0075509 ↑ INCREASED

fucosyltransferase activity GO:0008417 virus receptor activity GO:0001618 ↑ INCREASED

small intestine UBERON:0002108 epithelium of small intestine UBERON:0001902

Downstream

Cytoplasmic Replication and Innate Antiviral Antagonism Entry of the transcriptionally active double-layered particle initiates cytoplasmic viral RNA replication and innate immune evasion.

NSP4 Viroporin-Mediated Intracellular Calcium Mobilization Infected enterocytes synthesize and secrete the viral enterotoxin NSP4.

Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction Productive infection of mature villus enterocytes triggers DGAT1 degradation, translational arrest, and enterocyte loss.

Show evidence (5 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus infects and replicates in the mature, non-dividing enterocytes in the middle and tip of the villi and in enteroendocrine cells in the small intestine35, suggesting that these cell types express factors that are required for efficient infection and replication"

Establishes that rotavirus specifically infects mature non-dividing enterocytes at the middle and tips of small intestinal villi and enteroendocrine cells.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus attachment to host cells is mediated by the outer capsid protein VP4 (through its VP8* domain37) and binding partners on the host cell surface, including sialoglycans (such as gangliosides GM1 and GD1a) and histo-blood group antigens (HBGAs)"

Demonstrates that the VP8* domain of the outer capsid protein VP4 mediates rotavirus attachment to host cell-surface sialoglycans and histo-blood group antigens (HBGAs).

PMID:32992488 SUPPORT BACKGROUND Human clinical

"Interactions between rotavirus particles and HBGA receptors present in the gut can occur via the VP4 (VP8* subunit) ‘spike’ protein on the surface of the virion [14]."

Confirms that the virion surface spike protein VP4 (VP8* subunit) binds HBGA receptors in the gut.

+ 2 more references

Cytoplasmic Replication and Innate Antiviral Antagonism

Following cellular uptake, rotavirus genome replication and virion assembly take place in specialized cytoplasmic inclusions termed viroplasms, and progeny virions are released by enterocyte lysis or non-classical vesicular transport. Viral NSP1 and other rotavirus proteins inhibit signaling pathways downstream of host pattern recognition receptors (PRRs), blunting type I and type III interferon induction; in children with severe combined immunodeficiency (SCID), defective T-cell and antibody responses permit chronic viral replication and severe intestinal and systemic disease.

enterocyte of epithelium of small intestine CL:1000334

viral RNA genome replication GO:0039694 ↑ INCREASED negative regulation of type I interferon production GO:0032480 ↑ INCREASED

Downstream

NSP4 Viroporin-Mediated Intracellular Calcium Mobilization Cytoplasmic viral gene expression produces the nonstructural protein NSP4 at the endoplasmic reticulum.

Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction Viral replication drives host translational shutoff and enterocyte injury.

Systemic Antigenemia and Transient Viremia High-titer mucosal viral replication and enterocyte lysis release rotavirus antigens and infectious virions into the systemic circulation during acute infection.

Fever Viral replication and mucosal innate immune signaling trigger an acute systemic febrile response.

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Following cellular uptake, rotavirus replication and assembly occur in cytoplasmic viroplasms, and newly produced rotaviruses are released from the cells through cell lysis or Golgi-independent non-classical vesicular transport"

Establishes that rotavirus replication and assembly occur in cytoplasmic viroplasms followed by viral release via cell lysis or non-classical vesicular transport.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Model organism

"In vitro (with multiple cell types) and in vivo experiments in mice have shown that, depending on the tissue, virus strain and age of the animal, NSP1 or possibly other rotavirus proteins can inhibit the signalling pathways activated by PRRs, which might underlie the poor innate immune response..."

Demonstrates that rotavirus NSP1 inhibits pattern recognition receptor (PRR) signaling pathways to suppress innate antiviral immunity.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"The critical role of antibodies and T cells in protection against recurrent rotavirus infection can be observed in children with primary severe combined immunodeficiency (SCID, who have defective T cell and antibody responses), who can develop chronic rotavirus infection and intestinal and..."

Shows that intact T-cell and antibody immunity is required to clear rotavirus replication and prevent chronic intestinal and systemic infection.

Systemic Antigenemia and Transient Viremia

During the first 5 days of acute rotavirus gastroenteritis, viral antigens (antigenemia, reported in one study in at least 90% of acutely infected children) and infectious virions (viremia) enter the bloodstream across the damaged intestinal barrier. Antigenemia correlates with higher acute gastroenteritis severity and limited extraintestinal viral dissemination, including mild rotavirus-associated hepatitis with transient elevation of serum hepatic transaminases (ALT and AST), though direct causal links between antigenemia and other extraintestinal presentations remain unestablished in human cohorts.

blood UBERON:0000178

Downstream

Elevated Hepatic Transaminases Systemic viral dissemination and mild rotavirus-induced hepatic injury cause transient elevations of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST).

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Detection of viral antigens (that is, antigenaemia) and infectious viruses (that is, viraemia) in serum have been reported in children with rotavirus infection, and replication of rotavirus in sites other than the intestines, although limited, is likely to occur"

Establishes that rotavirus antigens (antigenemia) and infectious virus (viremia) enter the bloodstream in children with rotavirus infection and can lead to limited extraintestinal replication.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"One study reported antigenaemia in ≥90% of children with rotavirus infection until ~5 days after symptom onset, and some children had infectious virus in their serum"

Quantifies systemic antigenemia in at least 90% of children during the first 5 days of acute rotavirus illness alongside transient infectious viremia.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"In other studies, children with antigenaemia had more severe disease than children without antigenaemia, but the proportion of children with extra-intestinal presentations was not higher in those with antigenaemia"

Shows that systemic antigenemia is associated with greater acute disease severity, while direct enrichment of broader extraintestinal syndromes in antigenemic patients is not established.

NSP4 Viroporin-Mediated Intracellular Calcium Mobilization

Rotavirus nonstructural protein 4 (NSP4) is the first described viral enterotoxin. Acting both endogenously as an endoplasmic reticulum viroporin in infected cells and exogenously as a secreted enterotoxin that binds uninfected intestinal epithelial cells and signals through phospholipase C (PLC) and inositol 1,4,5-trisphosphate (IP3), NSP4 increases cytoplasmic free calcium levels and coordinates downstream ion transport changes.

enterocyte of epithelium of small intestine CL:1000334

release of sequestered calcium ion into cytosol GO:0051209 ↑ INCREASED

Downstream

Calcium-Activated Chloride Secretion Elevated cytosolic calcium gates apical calcium-activated chloride channels and inhibits electroneutral NaCl absorption.

Enteric Nervous System Secretomotor Activation NSP4-induced calcium signaling triggers paracrine 5-HT release from enteroendocrine cells that activates enteric secretomotor reflexes.

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Indeed, NSP4 secreted from cells infected with rotavirus binds to intestinal epithelial cells56 and signals through phospholipase C to increase cytoplasmic calcium levels, which activates calcium-dependent chloride channels"

Demonstrates that secreted NSP4 binds intestinal epithelial cells and signals through phospholipase C to elevate cytoplasmic calcium and activate calcium-dependent chloride channels.

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"Similarities between rotavirus infection and NSP4 function suggest that NSP4 is responsible for these enterotoxigenic effects."

Identifies NSP4 as the viral enterotoxin responsible for calcium-dependent enterotoxigenic effects.

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"NSP4-mediated ... may further facilitate diarrhea by signaling through other Ca2+-sensitive cellular processes (cation channels, ion and solute transporters) to potentiate fluid secretion while curtailing fluid absorption."

Explains how NSP4-driven intracellular calcium mobilization coordinates ion channel activation and transporter inhibition to drive fluid loss.

Calcium-Activated Chloride Secretion

NSP4-induced elevation of cytosolic free calcium activates calcium-gated chloride channels (including ANO1/TMEM16A) on the apical membrane of intestinal epithelial cells, driving transepithelial halide and chloride ion secretion into the gut lumen and creating an osmotic gradient that draws water into the lumen independently of cyclic nucleotides (cAMP/cGMP). Because rotavirus does not infect all enterocytes, sodium-glucose cotransporter 1 (SGLT1) function remains intact across uninfected enterocytes, enabling oral rehydration therapy.

enterocyte of epithelium of small intestine CL:1000334

ANO1 hgnc:21625

chloride transmembrane transport GO:1902476 ↑ INCREASED

intracellularly calcium-gated chloride channel activity GO:0005229 ↑ INCREASED

Downstream

Secretory Diarrhea Transepithelial chloride secretion and osmotic water movement into the small intestinal lumen produce profuse watery secretory diarrhea.

Dehydration Excessive luminal water and electrolyte secretion leads to rapid volume depletion in infants and young children.

Metabolic Acidosis Stool electrolyte and bicarbonate losses during profuse secretory diarrhea cause metabolic acidosis.

Show evidence (4 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Activation of these channels causes excessive secretion of chloride ions into the intestinal lumen, creating an osmotic gradient that facilitates the transport of water into the lumen, leading to secretory diarrhoea. Calcium-activated chloride channel inhibitors can prevent rotavirus-induced..."

Establishes that activation of calcium-activated chloride channels drives luminal chloride secretion, osmotic water movement, and secretory diarrhea in rotavirus infection.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"This observation indicates that a sufficient number of enterocytes have intact sodium–glucose cotransporter 1 function and suggests that rotavirus does not infect all enterocytes."

Confirms that sparing of uninfected enterocytes preserves SGLT1-mediated sodium-glucose cotransport during rotaviral secretory diarrhea.

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"In neonatal mouse pup mucosa models, ... leads to age-dependent halide ion movement across the plasma membrane, transepithelial Cl−secretion, and, unlike many microbial enterotoxins, initial cyclic nucleotide independence to secretory diarrhea."

Establishes that intracellular calcium elevation drives age-dependent transepithelial chloride secretion and cyclic-nucleotide-independent secretory diarrhea in young hosts.

+ 1 more reference

Enteric Nervous System Secretomotor Activation

Rotavirus infection and NSP4-mediated intracellular calcium elevation stimulate serotonin (5-hydroxytryptamine, 5-HT) secretion from enteroendocrine (enterochromaffin) cells in the small intestine. Paracrine 5-HT activates enteric nervous system (ENS) secretomotor and motility reflexes that amplify diarrheal fluid loss and intestinal hypermotility, and stimulates vagal afferent nerves projecting to brainstem emetic centers associated with nausea and vomiting.

enteric neuron CL:0007011

small intestine UBERON:0002108

Downstream

Calcium-Activated Chloride Secretion Enteric secretomotor reflex activation sustains transepithelial chloride and water secretion across the small intestinal mucosa.

Vomiting Serotonin-mediated activation of vagal afferent pathways projecting to brainstem emetic centers induces acute vomiting.

Abdominal Pain Enteric nervous system activation and increased small intestinal motility cause cramping abdominal pain.

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus infection and NSP4-mediated increase in intracellular calcium levels can induce secretion of 5-HT from enteroendocrine cells in humans and mice, which can activate enteric nerves that innervate the small intestine and ultimately lead to increased intestinal motility"

Demonstrates that rotavirus and NSP4 calcium signaling induce 5-HT release from enteroendocrine cells to activate small intestinal enteric nerves and increase motility.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus infection and NSP4-dependent 5-HT release can also activate vagal nerves that project to regions of the brain associated with nausea and vomiting"

Shows that NSP4-dependent 5-HT release activates vagal afferent pathways projecting to brainstem emetic centers.

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"This secondary component appears to involve the enteric nervous system and may be cyclic nucleotide dependent. Both phases of diarrhea occur in the absence of significant inflammation."

Demonstrates that a secondary enteric nervous system component sustains the rotavirus diarrheal response without requiring overt mucosal inflammation.

Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction

Rotavirus infection induces proteasome-dependent degradation of diacylglycerol O-acyltransferase 1 (DGAT1) and increases phosphorylation of eukaryotic translation initiation factor 2 alpha (eIF2alpha) in infected enterocytes. Loss of DGAT1 and global translational arrest downregulate apical brush-border enzymes (including lactase, sucrase, and maltase), disrupt enterocyte lipid droplet and membrane homeostasis, and cause cytolysis and desquamation of mature villus tip enterocytes with reactive crypt hyperplasia. Unabsorbed luminal disaccharides and solutes create an osmotic gradient that drives malabsorptive osmotic diarrhea.

enterocyte of epithelium of small intestine CL:1000334

cytolysis GO:0019835 ↑ INCREASED

epithelium of small intestine UBERON:0001902

Downstream

Secondary Lactase Deficiency and Carbohydrate Malabsorption Loss of mature villus enterocytes and proteasomal DGAT1 degradation deplete apical brush-border disaccharidases (particularly lactase), impairing lactose and carbohydrate digestion.

Malabsorptive Osmotic Diarrhea Depletion of apical brush-border disaccharidases and villus enterocyte loss leave unabsorbed luminal carbohydrates that drive osmotic diarrhea.

Dehydration Osmotic water retention in the gut lumen compounds secretory fluid losses to accelerate systemic dehydration.

Show evidence (3 references)

PMID:39548446 SUPPORT Human clinical

"As previously reported, in gastroenteritis caused by rotavirus (RV) infection, DGAT1 is degraded in RV-infected cells by a proteasome-dependent mechanism. DGAT1 loss reduces apical brush border enzymes which are required for normal enterocyte homeostasis."

Shows that rotavirus infection triggers proteasome-dependent degradation of DGAT1, depleting apical brush-border enzymes required for enterocyte homeostasis.

PMID:39548446 SUPPORT Human clinical

"Eukaryotic translation initiation factor 2 alpha (eIF2α) is a regulator of global cellular translation, with increased phosphorylated eIF2α levels in RV-infected cells and human DGAT1−/− intestinal enteroids putatively responsible for downregulated protein expression which leads to malabsorptive..."

Links increased eIF2alpha phosphorylation and DGAT1 loss in rotavirus-infected enterocytes to downregulated brush-border protein expression and malabsorptive diarrhea.

PMID:34431620 SUPPORT REVIEW SYNTHESIS Human clinical

"Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be..."

Establishes that rotaviral mucosal damage in infancy causes secondary lactase deficiency and transient carbohydrate malabsorption.

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Phenotypes

9

Digestive 4

Secretory Diarrhea VERY_FREQUENT HP:0005208

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Activation of these channels causes excessive secretion of chloride ions into the intestinal lumen, creating an osmotic gradient that facilitates the transport of water into the lumen, leading to secretory diarrhoea. Calcium-activated chloride channel inhibitors can prevent rotavirus-induced..."

Establishes secretory diarrhea driven by calcium-activated chloride secretion as a core clinical manifestation of rotavirus infection.

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"In neonatal mouse pup mucosa models, ... leads to age-dependent halide ion movement across the plasma membrane, transepithelial Cl−secretion, and, unlike many microbial enterotoxins, initial cyclic nucleotide independence to secretory diarrhea."

Documents secretory diarrhea driven by intracellular calcium elevation and transepithelial chloride secretion in rotavirus infection.

PMID:37842003 SUPPORT Human clinical

"Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."

Confirms diarrhea as a cardinal clinical feature of pediatric rotaviral enteritis.

Malabsorptive Osmotic Diarrhea FREQUENT HP:0033310

Show evidence (2 references)

PMID:39548446 SUPPORT Human clinical

"Eukaryotic translation initiation factor 2 alpha (eIF2α) is a regulator of global cellular translation, with increased phosphorylated eIF2α levels in RV-infected cells and human DGAT1−/− intestinal enteroids putatively responsible for downregulated protein expression which leads to malabsorptive..."

Demonstrates that rotavirus-induced translational downregulation and DGAT1 loss cause malabsorptive diarrhea.

PMID:34431620 SUPPORT REVIEW SYNTHESIS Human clinical

"Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be..."

Links rotaviral small intestinal mucosal injury to secondary lactase deficiency and osmotic carbohydrate malabsorption.

Vomiting VERY_FREQUENT HP:0002013

Show evidence (2 references)

PMID:37842003 SUPPORT Human clinical

"Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."

Documents vomiting as one of the core presenting symptoms of rotavirus enteritis in children.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus infection and NSP4-dependent 5-HT release can also activate vagal nerves that project to regions of the brain associated with nausea and vomiting"

Explains the neurogenic mechanism of vomiting in rotavirus infection via 5-HT-dependent vagal nerve activation.

Secondary Lactase Deficiency and Carbohydrate Malabsorption FREQUENT HP:0002024

Show evidence (2 references)

PMID:34431620 SUPPORT REVIEW SYNTHESIS Human clinical

"Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be..."

Directly establishes that rotavirus enteritis in infancy damages the small intestinal mucosa to cause transient secondary lactase deficiency and carbohydrate malabsorption.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"The administration of lactose-free formulas might reduce the duration of treatment and the risk of treatment failure143 and can be considered for selected children, such as those requiring hospitalization"

Supports the clinical relevance of secondary lactose malabsorption in hospitalized children with severe rotavirus gastroenteritis.

Metabolism 4

Fever FREQUENT HP:0001945

Show evidence (1 reference)

PMID:37842003 SUPPORT Human clinical

"Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."

Confirms high fever as a common clinical symptom in children with rotavirus enteritis.

Dehydration FREQUENT HP:0001944

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"In children, the manifestation of rotavirus disease ranges from no symptoms to mild, watery diarrhoea of short duration and to severe diarrhoea with vomiting and fever that can result in rapid dehydration with shock, electrolyte imbalance and death"

Directly establishes rapid dehydration with shock and electrolyte imbalance as the principal life-threatening complication of pediatric rotavirus diarrhea and vomiting.

Metabolic Acidosis OCCASIONAL HP:0001942

Show evidence (2 references)

PMID:8855579 SUPPORT REVIEW SYNTHESIS Human clinical

"Pathogens responsible for acute diarrhea include those which produce enterotoxin at the intestinal mucosal surface, inducing secretion but are not invasive (e.g., Vibrio cholerae); those which invade and disrupt the mucosal lining (e.g., shigella species); and rotavirus."

Identifies rotavirus as one of the primary pathogens causing acute diarrheal fluid and electrolyte loss.

PMID:8855579 SUPPORT REVIEW SYNTHESIS Human clinical

"An ORS must have sufficient sodium to replace losses on a volume to volume basis, a glucose concentration that matches that of sodium to ensure its delivery to the ileum, sufficient amounts of potassium and base (e.g., sodium bicarbonate or trisodium citrate dihydrate) to correct acidosis and to..."

Documents metabolic acidosis as a core electrolyte disturbance of acute diarrheal dehydration requiring base replacement (bicarbonate or citrate) in oral rehydration solutions.

Elevated Hepatic Transaminases OCCASIONAL Elevated circulating hepatic transaminase concentration HP:0002910

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"For example, mildly increased levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in blood can sometimes be observed during rotavirus infection and might be due to rotavirus-induced mild hepatitis"

Documents mild elevation of blood ALT and AST concentrations during acute rotavirus infection in children.

Constitutional 1

Abdominal Pain FREQUENT HP:0002027

Show evidence (1 reference)

PMID:37842003 SUPPORT Human clinical

"Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."

Establishes abdominal pain as a frequent symptom of pediatric rotaviral enteritis.

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Genetic Associations

1

FUT2 (Susceptibility and Oral Rotavirus Vaccine Response Modifier)

Gene: FUT2 hgnc:4013 gene page relationship_type: SUSCEPTIBILITY

Show evidence (2 references)

PMID:32992488 SUPPORT Human clinical

"Rotavirus-positive cases (RV+) comprised 74% (185/250) secretors (Se) and 26% (65/250) non-secretors, while rotavirus-negative controls (RV-) comprised 58% (144/250) secretors and 42% (106/250) non-secretors. The distributions of secretors versus non-secretors observed amongst cases and controls..."

Directly demonstrates in children with rotavirus gastroenteritis that FUT2 secretor status significantly increases susceptibility to rotavirus infection compared with non-secretors.

PMID:28329092 SUPPORT Human clinical

"rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate..."

Directly demonstrates that infants who are FUT2 nonsecretors have the lowest anti-rotavirus IgA seroconversion rate ("vaccine take") after oral G1P[8] rotavirus vaccination.

💊

Medical Actions

3

Oral Rehydration Therapy

Action: Fluid Therapy NCIT:C116537

Agent: sodium chloride CHEBI:26710 D-glucose CHEBI:17234

Platform: Small molecule

First-line supportive therapy consists of reduced-osmolarity (245 mOsm/L) oral rehydration salts (ORS) containing equimolar glucose (75 mmol/L) and sodium (75 mEq/L) plus potassium and base (citrate or bicarbonate), exploiting preserved SGLT1-mediated glucose-coupled sodium and water absorption across uninfected small intestinal enterocytes to prevent and reverse dehydration and metabolic acidosis.

Target Phenotypes: Dehydration HP:0001944 Metabolic acidosis HP:0001942

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"One of the most important medical advancements in the past 50 years that has saved millions of infant lives was that administration of ORS resulted in glucose-coupled sodium and water absorption in the small intestine137. Oral rehydration therapy has been used safely and successfully to prevent..."

Establishes oral rehydration salts (ORS) as the cornerstone therapy that drives glucose-coupled sodium and water absorption in the small intestine to prevent and treat rotavirus dehydration.

PMID:21359029 SUPPORT REVIEW SYNTHESIS Human clinical

"The efficacy of ORS solution for the treatment of children with acute non-cholera diarrhea has improved with the reduction of its sodium concentration to 75 mEq/l, its glucose concentration to 75 mmol/l, and its total osmolarity to 245 mOsm/l"

Documents the improved clinical efficacy of reduced-osmolarity (245 mOsm/L) oral rehydration solution containing 75 mEq/L sodium and 75 mmol/L glucose in childhood acute non-cholera diarrhea.

PMID:8855579 SUPPORT REVIEW SYNTHESIS Human clinical

"An ORS must have sufficient sodium to replace losses on a volume to volume basis, a glucose concentration that matches that of sodium to ensure its delivery to the ileum, sufficient amounts of potassium and base (e.g., sodium bicarbonate or trisodium citrate dihydrate) to correct acidosis and to..."

Explains how sodium, equimolar glucose, potassium, and base in oral rehydration solutions replace volume losses and correct metabolic acidosis.

Zinc Supplementation

Action: Pharmacotherapy NCIT:C15986

Agent: zinc sulfate CHEBI:35176

Platform: Small molecule

Oral zinc supplementation (10-20 mg daily for 10-14 days) administered as an adjunct to oral rehydration therapy restores intestinal mucosal barrier integrity, reduces stool output, and shortens the duration of diarrhea, vomiting, and fever in children with rotaviral enteritis, particularly in low-income settings with a high burden of malnutrition.

Target Phenotypes: Secretory diarrhea HP:0005208

Show evidence (3 references)

PMID:37842003 SUPPORT Human clinical

"Conventional therapy combined with the zinc preparation significantly shortened the duration of hyperthermia, vomiting, and diarrhea compared with the conventional treatment alone."

Demonstrates that adding oral zinc supplementation to conventional therapy significantly shortens the duration of fever, vomiting, and diarrhea in pediatric rotavirus enteritis.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"In addition, zinc supplementation can improve the outcome of acute diarrhoea in low-income regions, in which malnutrition is common."

Confirms that oral zinc supplementation improves clinical outcomes of acute rotaviral and childhood diarrhea in settings where malnutrition is prevalent.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"For children living in low-income regions, the WHO recommends daily zinc supplementation for infants and children for 10–14 days, starting as soon as the diarrhoea episode has been diagnosed"

Documents the WHO recommendation for a 10-14 day course of daily zinc supplementation initiated at diagnosis of childhood diarrhea.

Rotavirus Vaccination

Action: Vaccination NCIT:C15346

Agent: Rotavirus Vaccine NCIT:C96394

Platform: Vaccine

Oral live-attenuated rotavirus vaccination—including monovalent human attenuated G1P[8] vaccine (RV1, Rotarix) and pentavalent bovine-human reassortant G1, G2, G3, G4, P1A[8] vaccine (RV5, RotaTeq)—administered in early infancy induces intestinal secretory IgA and homotypic and heterotypic serum neutralizing antibodies targeting the outer capsid proteins VP7 and VP4 (VP8*/VP5*) as well as non-neutralizing mucosal anti-VP6 and anti-NSP4 immunity. Mucosal and systemic immunity blocks viral attachment and entry into villus enterocytes and neutralizes NSP4 enterotoxin activity, preventing severe dehydrating secretory and malabsorptive gastroenteritis.

Mechanism Target:

INHIBITS Host Glycan Attachment and Mature Villus Enterocyte Entry — Vaccine-induced mucosal secretory IgA and homotypic and heterotypic neutralizing antibodies against VP4 (VP8*/VP5*) and VP7 block viral attachment to enterocyte HBGAs and prevent host cell entry, while intracellular polymeric IgA transcytosis via pIgR intercepts double-layered particles via VP6.

Show evidence (1 reference)

PMID:29119972 SUPPORT INDIRECT REVIEW SYNTHESIS Human clinical

"vaccines can induce protection against other rotavirus strains with different P-types and G-types (that is, heterotypic responses)90, heterotypic neutralizing antibodies (either anti-VP4 antibodies or anti-VP7 antibodies) might have important roles in protection against rotavirus disease."

Demonstrates that rotavirus vaccines elicit heterotypic neutralizing anti-VP4 and anti-VP7 antibodies that block viral attachment and entry across diverse G and P genotypes.

INHIBITS NSP4 Viroporin-Mediated Intracellular Calcium Mobilization — By preventing productive enterocyte infection and eliciting mucosal IgA and neutralizing immunity, vaccination prevents downstream NSP4 enterotoxin-driven calcium mobilization and secretory chloride loss.

Show evidence (2 references)

PMID:29119972 SUPPORT INDIRECT REVIEW SYNTHESIS Human clinical

"Rotavirus primarily infects enterocytes and induces diarrhoea through the destruction of absorptive enterocytes (leading to malabsorption), intestinal secretion stimulated by rotavirus non-structural protein 4 and activation of the enteric nervous system."

Establishes that rotavirus infection of enterocytes drives NSP4-stimulated intestinal secretion, which vaccine-induced mucosal immunity prevents upstream.

PMID:29119972 SUPPORT INDIRECT REVIEW SYNTHESIS Model organism

"In adult mice, protection from rotavirus reinfection is almost absolute and is mostly mediated by intestinal IgA antibodies90, the production of which is largely dependent on the activation of CD4+ T cells"

Demonstrates that CD4+ T-cell-dependent intestinal IgA antibodies protect against productive rotavirus infection and its downstream enterotoxigenic sequelae.

INHIBITS Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction — Prevention of extensive villus enterocyte infection by vaccine-elicited mucosal immunity preserves DGAT1 expression, apical brush-border disaccharidase activity, and mucosal architecture.

Show evidence (2 references)

PMID:29119972 SUPPORT INDIRECT REVIEW SYNTHESIS Human clinical

"Rotavirus primarily infects enterocytes and induces diarrhoea through the destruction of absorptive enterocytes (leading to malabsorption), intestinal secretion stimulated by rotavirus non-structural protein 4 and activation of the enteric nervous system."

Identifies destruction of absorptive enterocytes and resulting malabsorption as core consequences of rotavirus infection that vaccination prevents.

PMID:29119972 SUPPORT INDIRECT REVIEW SYNTHESIS Human clinical

"Both vaccines are highly effective in preventing severe rotavirus disease in high-income countries117 but reduce the incidence of severe rotavirus disease by ~50–60% in many low-income countries"

Demonstrates that rotavirus vaccination prevents severe rotavirus gastroenteritis and associated absorptive enterocyte destruction in human populations.

Effect differs by subgroup:

genotype FUT2 non-secretor (se/se) infants vs FUT2 secretor infants (especially blood group O secretors) — smaller effect on Oral P[8]-based live-attenuated rotavirus vaccine replication and anti-rotavirus IgA seroconversion (vaccine take)

Because live-attenuated oral rotavirus vaccines containing P[8] VP4 spikes rely on FUT2-dependent H type 1 mucosal glycans to attach to and replicate in small intestinal enterocytes, FUT2 non-secretor status markedly reduces vaccine replication and anti-rotavirus IgA seroconversion ("take") while also conferring baseline genetic resistance to homotypic P[8] wild-type strains.

Show evidence (1 reference)

PMID:28329092 SUPPORT Human clinical

"rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate..."

Directly shows in a clinical trial of oral G1P[8] rotavirus vaccine that FUT2 non-secretor infants have significantly lower IgA seroconversion (19%) than secretor infants (30-51%).

Show evidence (4 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Two rotavirus vaccines are broadly used worldwide: the RV5 vaccine, RotaTeq (Merck, USA), and the RV1 vaccine, Rotarix (GlaxoSmithKline, Belgium). The RV5 vaccine is a live attenuated, pentavalent vaccine, which is composed of five bovine–human reassortant rotaviruses that express either human..."

Characterizes the two globally used live-attenuated oral rotavirus vaccines, RV5 (RotaTeq) and RV1 (Rotarix), including the pentavalent bovine-human reassortant VP4 and VP7 antigens of RV5.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Both vaccines are highly effective in preventing severe rotavirus disease in high-income countries117 but reduce the incidence of severe rotavirus disease by ~50–60% in many low-income countries"

Documents clinical effectiveness of RV1 and RV5 oral rotavirus vaccines against severe rotavirus gastroenteritis across high- and low-income settings.

PMID:28329092 SUPPORT Human clinical

"rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate..."

Demonstrates that host FUT2 secretor status and salivary ABO blood group phenotype govern mucosal IgA seroconversion to oral G1P[8] rotavirus vaccination.

+ 1 more reference

🔬

Diagnosis

2

Stool Rotavirus Antigen Immunoassay

Clinical laboratory confirmation of rotaviral enteritis is performed by detecting rotavirus group A antigen (primarily inner capsid protein VP6) in stool specimens using enzyme-linked immunosorbent assay (ELISA) or rapid lateral-flow immunochromatography.

Diagnostic Procedure NCIT:C18020

Results: Detection of rotavirus antigen in feces confirms acute rotaviral enteritis.

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"When a laboratory-confirmed diagnosis of rotavirus infection is requested by physicians in the clinical setting, rotavirus antigen can be detected in stools using enzyme-linked immunosorbent assay (ELISA) or immunochromatography. In vaccine and epidemiological studies, these assays are often..."

Establishes stool antigen detection by ELISA or immunochromatography as the standard clinical diagnostic test for rotavirus infection.

Stool Reverse Transcription Polymerase Chain Reaction (RT-PCR)

Reverse transcription polymerase chain reaction (RT-PCR) on stool specimens provides high-sensitivity detection of rotavirus dsRNA and enables G (VP7) and P (VP4) genotyping to differentiate wild-type strains and vaccine viruses.

Polymerase Chain Reaction NCIT:C17003

Results: Amplification of rotavirus RNA segments in stool with optional VP7 (G) and VP4 (P) genotyping.

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"When a laboratory-confirmed diagnosis of rotavirus infection is requested by physicians in the clinical setting, rotavirus antigen can be detected in stools using enzyme-linked immunosorbent assay (ELISA) or immunochromatography. In vaccine and epidemiological studies, these assays are often..."

Establishes RT-PCR of stool specimens as a higher-sensitivity diagnostic method that also enables G and P genotyping of rotavirus isolates.

📈

Progression

3

Onset

Age: Infancy to early childhood (<5 years; peak 4-23 months)

Symptomatic rotaviral enteritis predominantly affects infants and young children under 5 years of age (with peak incidence between 4 and 23 months of age after maternal antibodies wane), whereas neonates under 1 month of age and infected adults are typically asymptomatic or experience mild disease.

Show evidence (2 references)

DOI:10.1152/ajpgi.2001.281.2.g303 SUPPORT REVIEW SYNTHESIS Model organism

"Rotaviral infection in neonatal animals and young children leads to acute self-limiting diarrhea, but infected adults are mainly asymptomatic."

Documents the age-dependent onset of symptomatic self-limiting diarrhea in infants and young children compared with largely asymptomatic infection in adults.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"The first rotavirus infections in infants >3 months of age are likely symptomatic and accordingly the incidence of rotavirus disease peaks between 4 and 23 months of age"

Establishes that symptomatic primary rotavirus infection peaks between 4 and 23 months of age in infancy and early childhood.

Acute Gastroenteritis Phase

Duration: 1-5 days

Characterized by abrupt onset of forceful vomiting and fever followed by frequent watery non-bloody diarrhea lasting 1 to 5 days, with risk of rapid dehydration and electrolyte imbalance in untreated infants.

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Symptoms can last for 1–5 days, but if they last for >1 week, medical consultation should be sought. Increasing and/or intense vomiting and repeated episodes of watery diarrhoea (for example, >1 episode per hour, especially if abundant) are the main features that indicate the need for specific treatment."

Defines the 1-5 day acute symptomatic phase of vomiting and repeated watery diarrhea episodes.

Resolution and Mucosal Recovery

Duration: ~1 week clinical resolution (4-57 days viral RNA shedding)

Clinical diarrhea and vomiting resolve within approximately 1 week as villus enterocytes regenerate, though transient secondary lactase deficiency and stool rotavirus RNA shedding detectable by RT-PCR may persist for longer periods.

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"The window for the detection of viral shedding using ELISA usually ends within 1 week after the onset of illness, but the virus can be detected for longer periods by more-sensitive assays, such as RT-PCR107. Indeed, viral shedding ranges from 4 to 57 days108, and the quantity of RNA shed..."

Documents resolution of high-titer antigen shedding within 1 week alongside prolonged RT-PCR-detectable viral RNA shedding during recovery.

📊

Prevalence

1

Children under 5 years of age globally

Period prevalence Common

Virtually all children globally experience at least one rotavirus infection by 5 years of age, and rotaviruses are the leading cause of severe dehydrating diarrhea in infants and young children under 5 years of age worldwide.

Show evidence (3 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus infections are a leading cause of severe, dehydrating gastroenteritis in children <5 years of age."

Establishes rotavirus as a leading global cause of severe dehydrating gastroenteritis in children under 5 years of age.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotaviruses are ubiquitous and infect almost every child globally by 3–5 years of age"

Supports the near-universal period prevalence of rotavirus infection in children under 5 years of age worldwide.

PMID:37842003 SUPPORT Human clinical

"Rotavirus (RV) is one of the most common pathogens causing diarrhea in infants and young children worldwide."

Confirms the high global burden of rotavirus diarrhea in infants and young children.

🦠

Infectious Agent

1

Rotavirus A

Non-enveloped, triple-layered icosahedral virus with an 11-segment double-stranded RNA genome encoding six structural proteins (VP1-VP4, VP6, VP7) and six nonstructural proteins (NSP1-NSP6). Binary classification into G (glycoprotein VP7) and P (protease-sensitive spike protein VP4, cleaved by luminal trypsin into VP8* and VP5*) genotypes defines antigenic diversity and host receptor tropism.

Rotavirus A NCBITaxon:28875

Show evidence (4 references)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotaviruses are non-enveloped double-stranded RNA (dsRNA) viruses that have a complex architecture of three concentric capsids that surround a genome of 11 segments of dsRNA"

Defines the non-enveloped triple-layered capsid architecture and 11-segment dsRNA genome of rotaviruses.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"The RNA segments encode six structural viral proteins (VP1, VP2, VP3, VP4, VP6 and VP7) and six non-structural proteins (NSP1, NSP2, NSP3, NSP4, NSP5 and NSP6)"

Establishes the six structural (VP1-VP4, VP6, VP7) and six nonstructural (NSP1-NSP6) proteins encoded by the rotavirus genome.

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Species A rotaviruses are further classified into different genotypes, based on sequence differences in RNA segments 7 and 4 (encoding VP7 and VP4, respectively), which form the basis of the dual nomenclature system used for species A rotavirus strains, whereby glycoprotein (G, or VP7) and..."

Explains the binary G (VP7 glycoprotein) and P (VP4 protease-cleaved spike protein) genotype classification of Rotavirus A.

+ 1 more reference

↔️

Transmission

1

Fecal-Oral Transmission

Transmitted via the fecal-oral route through direct person-to-person contact or contact with contaminated fomites, water, and food. Triple-layered virions are shed in high concentrations in stool during diarrheal episodes, and only a small infectious dose is required to infect susceptible hosts.

Show evidence (1 reference)

PMID:29119972 SUPPORT REVIEW SYNTHESIS Human clinical

"Rotavirus is shed in large quantities in stools during episodes of rotavirus-associated diarrhoea. The virus is transmitted predominantly through the faecal–oral route, mainly by close person-to-person contact4, and few virions are needed to cause disease in susceptible hosts32. Contaminated..."

Directly documents high-titer stool shedding, predominant fecal-oral person-to-person transmission, low infectious dose, and fomite transmission of rotavirus.

{ }

Source YAML

click to show

name: Rotaviral Enteritis
creation_date: "2026-04-20T00:00:00Z"
category: Infectious
parents:
- Infectious Disease
- Gastrointestinal Disease
disease_term:
  preferred_term: rotaviral enteritis
  term:
    id: MONDO:0005194
    label: Rotavirus infection
synonyms:
- Rotavirus infection
- Rotavirus gastroenteritis
- Infantile rotaviral enteritis
description: >-
  Rotaviral enteritis is an acute viral gastroenteritis caused primarily by Group A
  rotavirus (Reoviridae), a triple-layered non-enveloped double-stranded RNA virus
  that infects mature enterocytes at the tips of small intestinal villi. Disease is
  driven by a dual mechanism combining NSP4 enterotoxin-mediated intracellular calcium
  mobilization, chloride secretion, and enteric nervous system activation (early
  secretory diarrhea) with proteasomal DGAT1 degradation, brush-border disaccharidase
  loss, and villus blunting (secondary malabsorptive osmotic diarrhea). Host
  histo-blood group antigen (HBGA) secretor status controlled by FUT2 and Lewis status
  controlled by FUT3 govern VP8*-mediated attachment and strain-specific susceptibility
  to both natural infection and live-attenuated oral rotavirus vaccines.
classifications:
  harrisons_chapter:
  - classification_value: INFECTIOUS_DISEASES
  - classification_value: GASTROINTESTINAL
prevalence:
- population: Children under 5 years of age globally
  measure_type: PERIOD_PREVALENCE
  prevalence_class: COMMON
  notes: >-
    Virtually all children globally experience at least one rotavirus infection by
    5 years of age, and rotaviruses are the leading cause of severe dehydrating
    diarrhea in infants and young children under 5 years of age worldwide.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus infections are a leading cause of severe, dehydrating gastroenteritis in children <5 years of age."
    explanation: Establishes rotavirus as a leading global cause of severe dehydrating gastroenteritis in children under 5 years of age.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotaviruses are ubiquitous and infect almost every child globally by 3–5 years of age"
    explanation: Supports the near-universal period prevalence of rotavirus infection in children under 5 years of age worldwide.
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Rotavirus (RV) is one of the most common pathogens causing diarrhea in infants and young children worldwide."
    explanation: Confirms the high global burden of rotavirus diarrhea in infants and young children.
progression:
- phase: Onset
  age_range: Infancy to early childhood (<5 years; peak 4-23 months)
  notes: >-
    Symptomatic rotaviral enteritis predominantly affects infants and young children
    under 5 years of age (with peak incidence between 4 and 23 months of age after
    maternal antibodies wane), whereas neonates under 1 month of age and infected
    adults are typically asymptomatic or experience mild disease.
  evidence:
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotaviral infection in neonatal animals and young children leads to acute self-limiting diarrhea, but infected adults are mainly asymptomatic."
    explanation: Documents the age-dependent onset of symptomatic self-limiting diarrhea in infants and young children compared with largely asymptomatic infection in adults.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The first rotavirus infections in infants >3 months of age are likely symptomatic and accordingly the incidence of rotavirus disease peaks between 4 and 23 months of age"
    explanation: Establishes that symptomatic primary rotavirus infection peaks between 4 and 23 months of age in infancy and early childhood.
- phase: Acute Gastroenteritis Phase
  duration: 1-5 days
  notes: >-
    Characterized by abrupt onset of forceful vomiting and fever followed by frequent
    watery non-bloody diarrhea lasting 1 to 5 days, with risk of rapid dehydration
    and electrolyte imbalance in untreated infants.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Symptoms can last for 1–5 days, but if they last for >1 week, medical consultation should be sought. Increasing and/or intense vomiting and repeated episodes of watery diarrhoea (for example, >1 episode per hour, especially if abundant) are the main features that indicate the need for specific treatment."
    explanation: Defines the 1-5 day acute symptomatic phase of vomiting and repeated watery diarrhea episodes.
- phase: Resolution and Mucosal Recovery
  duration: ~1 week clinical resolution (4-57 days viral RNA shedding)
  notes: >-
    Clinical diarrhea and vomiting resolve within approximately 1 week as villus
    enterocytes regenerate, though transient secondary lactase deficiency and stool
    rotavirus RNA shedding detectable by RT-PCR may persist for longer periods.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The window for the detection of viral shedding using ELISA usually ends within 1 week after the onset of illness, but the virus can be detected for longer periods by more-sensitive assays, such as RT-PCR107. Indeed, viral shedding ranges from 4 to 57 days108, and the quantity of RNA shed directly correlates with the severity of rotavirus-associated diarrhoea in children"
    explanation: Documents resolution of high-titer antigen shedding within 1 week alongside prolonged RT-PCR-detectable viral RNA shedding during recovery.
infectious_agent:
- name: Rotavirus A
  infectious_agent_term:
    preferred_term: Rotavirus A
    term:
      id: NCBITaxon:28875
      label: Rotavirus A
  description: >-
    Non-enveloped, triple-layered icosahedral virus with an 11-segment double-stranded
    RNA genome encoding six structural proteins (VP1-VP4, VP6, VP7) and six
    nonstructural proteins (NSP1-NSP6). Binary classification into G (glycoprotein
    VP7) and P (protease-sensitive spike protein VP4, cleaved by luminal trypsin into
    VP8* and VP5*) genotypes defines antigenic diversity and host receptor tropism.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotaviruses are non-enveloped double-stranded RNA (dsRNA) viruses that have a complex architecture of three concentric capsids that surround a genome of 11 segments of dsRNA"
    explanation: Defines the non-enveloped triple-layered capsid architecture and 11-segment dsRNA genome of rotaviruses.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The RNA segments encode six structural viral proteins (VP1, VP2, VP3, VP4, VP6 and VP7) and six non-structural proteins (NSP1, NSP2, NSP3, NSP4, NSP5 and NSP6)"
    explanation: Establishes the six structural (VP1-VP4, VP6, VP7) and six nonstructural (NSP1-NSP6) proteins encoded by the rotavirus genome.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Species A rotaviruses are further classified into different genotypes, based on sequence differences in RNA segments 7 and 4 (encoding VP7 and VP4, respectively), which form the basis of the dual nomenclature system used for species A rotavirus strains, whereby glycoprotein (G, or VP7) and protease-cleaved protein (P, or VP4) subtypes are differentiated"
    explanation: Explains the binary G (VP7 glycoprotein) and P (VP4 protease-cleaved spike protein) genotype classification of Rotavirus A.
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Rotavirus (RV) is one of the most common pathogens causing diarrhea in infants and young children worldwide."
    explanation: Establishes rotavirus as a major viral pathogen causing infantile and childhood enteritis.
transmission:
- name: Fecal-Oral Transmission
  description: >-
    Transmitted via the fecal-oral route through direct person-to-person contact or
    contact with contaminated fomites, water, and food. Triple-layered virions are
    shed in high concentrations in stool during diarrheal episodes, and only a small
    infectious dose is required to infect susceptible hosts.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus is shed in large quantities in stools during episodes of rotavirus-associated diarrhoea. The virus is transmitted predominantly through the faecal–oral route, mainly by close person-to-person contact4, and few virions are needed to cause disease in susceptible hosts32. Contaminated fomites (that is, objects that can enable the transmission of pathogens) also have a role in the transmission of rotavirus, especially in out-of-home care settings and hospitals"
    explanation: Directly documents high-titer stool shedding, predominant fecal-oral person-to-person transmission, low infectious dose, and fomite transmission of rotavirus.
pathophysiology:
- name: Host Glycan Attachment and Mature Villus Enterocyte Entry
  conforms_to: "vaccine_induced_mucosal_iga_neutralization#Enteric Pathogen Luminal Attachment and Mucosal Epithelial Entry"
  description: >-
    Following luminal trypsin cleavage of the outer capsid spike protein VP4 into the
    distal lectin domain VP8* and membrane-penetration domain VP5*, rotavirus attaches
    to mature non-dividing enterocytes in the middle and tip of small intestinal villi
    and to enteroendocrine cells. VP8* binds host cell-surface sialoglycans and
    histo-blood group antigens (HBGAs) synthesized on the intestinal mucosa under the
    control of FUT2 (secretor status) in a P-genotype-specific manner (with predominant
    human P[8] and P[4] strains preferentially binding secretor HBGAs), followed by
    endocytic entry into the enterocyte cytoplasm.
  cell_types:
  - preferred_term: enterocyte of epithelium of small intestine
    term:
      id: CL:1000334
      label: enterocyte of epithelium of small intestine
  locations:
  - preferred_term: small intestine
    term:
      id: UBERON:0002108
      label: small intestine
  - preferred_term: epithelium of small intestine
    term:
      id: UBERON:0001902
      label: epithelium of small intestine
  biological_processes:
  - preferred_term: endocytosis involved in viral entry into host cell
    modifier: INCREASED
    term:
      id: GO:0075509
      label: endocytosis involved in viral entry into host cell
  molecular_functions:
  - preferred_term: fucosyltransferase activity
    term:
      id: GO:0008417
      label: fucosyltransferase activity
  - preferred_term: virus receptor activity
    modifier: INCREASED
    term:
      id: GO:0001618
      label: virus receptor activity
  genes:
  - preferred_term: FUT2
    term:
      id: hgnc:4013
      label: FUT2
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus infects and replicates in the mature, non-dividing enterocytes in the middle and tip of the villi and in enteroendocrine cells in the small intestine35, suggesting that these cell types express factors that are required for efficient infection and replication"
    explanation: Establishes that rotavirus specifically infects mature non-dividing enterocytes at the middle and tips of small intestinal villi and enteroendocrine cells.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus attachment to host cells is mediated by the outer capsid protein VP4 (through its VP8* domain37) and binding partners on the host cell surface, including sialoglycans (such as gangliosides GM1 and GD1a) and histo-blood group antigens (HBGAs)"
    explanation: Demonstrates that the VP8* domain of the outer capsid protein VP4 mediates rotavirus attachment to host cell-surface sialoglycans and histo-blood group antigens (HBGAs).
  - reference: PMID:32992488
    reference_title: "FUT2 Secretor Status Influences Susceptibility to VP4 Strain-Specific Rotavirus Infections in South African Children"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: BACKGROUND
    snippet: "Interactions between rotavirus particles and HBGA receptors present in the gut can occur via the VP4 (VP8* subunit) ‘spike’ protein on the surface of the virion [14]."
    explanation: Confirms that the virion surface spike protein VP4 (VP8* subunit) binds HBGA receptors in the gut.
  - reference: PMID:32992488
    reference_title: "FUT2 Secretor Status Influences Susceptibility to VP4 Strain-Specific Rotavirus Infections in South African Children"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The results from this study indicate that secretors were more susceptible to rotavirus infection, and non-secretors seemed to display a natural resistance. The absence of HBGAs in the gastric mucosa of non-secretors appeared to reduce susceptibility to rotavirus, possibly by limiting the attachment stage of binding and entry during rotavirus infection [31]."
    explanation: Links FUT2 secretor-dependent HBGA expression in the gut mucosa to rotavirus attachment, entry, and host susceptibility.
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "RV enters the body mainly through the gastrointestinal epithelium, and RV is symbiotic with the intestinal epithelial microbiota; therefore, the influence of intestinal microorganisms exists throughout RV enteritis"
    explanation: Confirms that rotavirus enters the host primarily through the gastrointestinal epithelium.
  downstream:
  - target: Cytoplasmic Replication and Innate Antiviral Antagonism
    description: Entry of the transcriptionally active double-layered particle initiates cytoplasmic viral RNA replication and innate immune evasion.
  - target: NSP4 Viroporin-Mediated Intracellular Calcium Mobilization
    description: Infected enterocytes synthesize and secrete the viral enterotoxin NSP4.
  - target: Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction
    description: Productive infection of mature villus enterocytes triggers DGAT1 degradation, translational arrest, and enterocyte loss.

- name: Cytoplasmic Replication and Innate Antiviral Antagonism
  description: >-
    Following cellular uptake, rotavirus genome replication and virion assembly take
    place in specialized cytoplasmic inclusions termed viroplasms, and progeny virions
    are released by enterocyte lysis or non-classical vesicular transport. Viral NSP1
    and other rotavirus proteins inhibit signaling pathways downstream of host pattern
    recognition receptors (PRRs), blunting type I and type III interferon induction;
    in children with severe combined immunodeficiency (SCID), defective T-cell and
    antibody responses permit chronic viral replication and severe intestinal and
    systemic disease.
  cell_types:
  - preferred_term: enterocyte of epithelium of small intestine
    term:
      id: CL:1000334
      label: enterocyte of epithelium of small intestine
  biological_processes:
  - preferred_term: viral RNA genome replication
    modifier: INCREASED
    term:
      id: GO:0039694
      label: viral RNA genome replication
  - preferred_term: negative regulation of type I interferon production
    modifier: INCREASED
    term:
      id: GO:0032480
      label: negative regulation of type I interferon production
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Following cellular uptake, rotavirus replication and assembly occur in cytoplasmic viroplasms, and newly produced rotaviruses are released from the cells through cell lysis or Golgi-independent non-classical vesicular transport"
    explanation: Establishes that rotavirus replication and assembly occur in cytoplasmic viroplasms followed by viral release via cell lysis or non-classical vesicular transport.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "In vitro (with multiple cell types) and in vivo experiments in mice have shown that, depending on the tissue, virus strain and age of the animal, NSP1 or possibly other rotavirus proteins can inhibit the signalling pathways activated by PRRs, which might underlie the poor innate immune response to rotaviruses"
    explanation: Demonstrates that rotavirus NSP1 inhibits pattern recognition receptor (PRR) signaling pathways to suppress innate antiviral immunity.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The critical role of antibodies and T cells in protection against recurrent rotavirus infection can be observed in children with primary severe combined immunodeficiency (SCID, who have defective T cell and antibody responses), who can develop chronic rotavirus infection and intestinal and systemic disease"
    explanation: Shows that intact T-cell and antibody immunity is required to clear rotavirus replication and prevent chronic intestinal and systemic infection.
  downstream:
  - target: NSP4 Viroporin-Mediated Intracellular Calcium Mobilization
    description: Cytoplasmic viral gene expression produces the nonstructural protein NSP4 at the endoplasmic reticulum.
  - target: Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction
    description: Viral replication drives host translational shutoff and enterocyte injury.
  - target: Systemic Antigenemia and Transient Viremia
    description: High-titer mucosal viral replication and enterocyte lysis release rotavirus antigens and infectious virions into the systemic circulation during acute infection.
  - target: Fever
    description: Viral replication and mucosal innate immune signaling trigger an acute systemic febrile response.

- name: Systemic Antigenemia and Transient Viremia
  description: >-
    During the first 5 days of acute rotavirus gastroenteritis, viral antigens
    (antigenemia, reported in one study in at least 90% of acutely infected children)
    and infectious virions (viremia) enter the bloodstream across the damaged
    intestinal barrier. Antigenemia correlates with higher acute gastroenteritis
    severity and limited extraintestinal viral dissemination, including mild
    rotavirus-associated hepatitis with transient elevation of serum hepatic
    transaminases (ALT and AST), though direct causal links between antigenemia and
    other extraintestinal presentations remain unestablished in human cohorts.
  locations:
  - preferred_term: blood
    term:
      id: UBERON:0000178
      label: blood
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Detection of viral antigens (that is, antigenaemia) and infectious viruses (that is, viraemia) in serum have been reported in children with rotavirus infection, and replication of rotavirus in sites other than the intestines, although limited, is likely to occur"
    explanation: Establishes that rotavirus antigens (antigenemia) and infectious virus (viremia) enter the bloodstream in children with rotavirus infection and can lead to limited extraintestinal replication.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "One study reported antigenaemia in ≥90% of children with rotavirus infection until ~5 days after symptom onset, and some children had infectious virus in their serum"
    explanation: Quantifies systemic antigenemia in at least 90% of children during the first 5 days of acute rotavirus illness alongside transient infectious viremia.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "In other studies, children with antigenaemia had more severe disease than children without antigenaemia, but the proportion of children with extra-intestinal presentations was not higher in those with antigenaemia"
    explanation: Shows that systemic antigenemia is associated with greater acute disease severity, while direct enrichment of broader extraintestinal syndromes in antigenemic patients is not established.
  downstream:
  - target: Elevated Hepatic Transaminases
    description: Systemic viral dissemination and mild rotavirus-induced hepatic injury cause transient elevations of serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST).

- name: NSP4 Viroporin-Mediated Intracellular Calcium Mobilization
  description: >-
    Rotavirus nonstructural protein 4 (NSP4) is the first described viral enterotoxin.
    Acting both endogenously as an endoplasmic reticulum viroporin in infected cells and
    exogenously as a secreted enterotoxin that binds uninfected intestinal epithelial
    cells and signals through phospholipase C (PLC) and inositol 1,4,5-trisphosphate
    (IP3), NSP4 increases cytoplasmic free calcium levels and coordinates downstream
    ion transport changes.
  cell_types:
  - preferred_term: enterocyte of epithelium of small intestine
    term:
      id: CL:1000334
      label: enterocyte of epithelium of small intestine
  biological_processes:
  - preferred_term: release of sequestered calcium ion into cytosol
    modifier: INCREASED
    term:
      id: GO:0051209
      label: release of sequestered calcium ion into cytosol
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Indeed, NSP4 secreted from cells infected with rotavirus binds to intestinal epithelial cells56 and signals through phospholipase C to increase cytoplasmic calcium levels, which activates calcium-dependent chloride channels"
    explanation: Demonstrates that secreted NSP4 binds intestinal epithelial cells and signals through phospholipase C to elevate cytoplasmic calcium and activate calcium-dependent chloride channels.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "Similarities between rotavirus infection and NSP4 function suggest that NSP4 is responsible for these enterotoxigenic effects."
    explanation: Identifies NSP4 as the viral enterotoxin responsible for calcium-dependent enterotoxigenic effects.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "NSP4-mediated ... may further facilitate diarrhea by signaling through other Ca2+-sensitive cellular processes (cation channels, ion and solute transporters) to potentiate fluid secretion while curtailing fluid absorption."
    explanation: Explains how NSP4-driven intracellular calcium mobilization coordinates ion channel activation and transporter inhibition to drive fluid loss.
  downstream:
  - target: Calcium-Activated Chloride Secretion
    description: Elevated cytosolic calcium gates apical calcium-activated chloride channels and inhibits electroneutral NaCl absorption.
  - target: Enteric Nervous System Secretomotor Activation
    description: NSP4-induced calcium signaling triggers paracrine 5-HT release from enteroendocrine cells that activates enteric secretomotor reflexes.

- name: Calcium-Activated Chloride Secretion
  description: >-
    NSP4-induced elevation of cytosolic free calcium activates calcium-gated chloride
    channels (including ANO1/TMEM16A) on the apical membrane of intestinal epithelial
    cells, driving transepithelial halide and chloride ion secretion into the gut lumen
    and creating an osmotic gradient that draws water into the lumen independently of
    cyclic nucleotides (cAMP/cGMP). Because rotavirus does not infect all enterocytes,
    sodium-glucose cotransporter 1 (SGLT1) function remains intact across uninfected
    enterocytes, enabling oral rehydration therapy.
  cell_types:
  - preferred_term: enterocyte of epithelium of small intestine
    term:
      id: CL:1000334
      label: enterocyte of epithelium of small intestine
  biological_processes:
  - preferred_term: chloride transmembrane transport
    modifier: INCREASED
    term:
      id: GO:1902476
      label: chloride transmembrane transport
  molecular_functions:
  - preferred_term: intracellularly calcium-gated chloride channel activity
    modifier: INCREASED
    term:
      id: GO:0005229
      label: intracellularly calcium-gated chloride channel activity
  genes:
  - preferred_term: ANO1
    term:
      id: hgnc:21625
      label: ANO1
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Activation of these channels causes excessive secretion of chloride ions into the intestinal lumen, creating an osmotic gradient that facilitates the transport of water into the lumen, leading to secretory diarrhoea. Calcium-activated chloride channel inhibitors can prevent rotavirus-induced secretory diarrhoea in neonatal mice, supporting the role of NSP4 in the development of secretory diarrhoea"
    explanation: Establishes that activation of calcium-activated chloride channels drives luminal chloride secretion, osmotic water movement, and secretory diarrhea in rotavirus infection.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "This observation indicates that a sufficient number of enterocytes have intact sodium–glucose cotransporter 1 function and suggests that rotavirus does not infect all enterocytes."
    explanation: Confirms that sparing of uninfected enterocytes preserves SGLT1-mediated sodium-glucose cotransport during rotaviral secretory diarrhea.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "In neonatal mouse pup mucosa models, ... leads to age-dependent halide ion movement across the plasma membrane, transepithelial Cl−secretion, and, unlike many microbial enterotoxins, initial cyclic nucleotide independence to secretory diarrhea."
    explanation: Establishes that intracellular calcium elevation drives age-dependent transepithelial chloride secretion and cyclic-nucleotide-independent secretory diarrhea in young hosts.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotaviral infection in neonatal animals and young children leads to acute self-limiting diarrhea, but infected adults are mainly asymptomatic."
    explanation: Explains the age-dependent clinical expression of rotavirus secretory diarrhea in infants and young children.
  downstream:
  - target: Secretory Diarrhea
    description: Transepithelial chloride secretion and osmotic water movement into the small intestinal lumen produce profuse watery secretory diarrhea.
  - target: Dehydration
    description: Excessive luminal water and electrolyte secretion leads to rapid volume depletion in infants and young children.
  - target: Metabolic Acidosis
    description: Stool electrolyte and bicarbonate losses during profuse secretory diarrhea cause metabolic acidosis.

- name: Enteric Nervous System Secretomotor Activation
  description: >-
    Rotavirus infection and NSP4-mediated intracellular calcium elevation stimulate
    serotonin (5-hydroxytryptamine, 5-HT) secretion from enteroendocrine
    (enterochromaffin) cells in the small intestine. Paracrine 5-HT activates enteric
    nervous system (ENS) secretomotor and motility reflexes that amplify diarrheal
    fluid loss and intestinal hypermotility, and stimulates vagal afferent nerves
    projecting to brainstem emetic centers associated with nausea and vomiting.
  cell_types:
  - preferred_term: enteric neuron
    term:
      id: CL:0007011
      label: enteric neuron
  locations:
  - preferred_term: small intestine
    term:
      id: UBERON:0002108
      label: small intestine
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus infection and NSP4-mediated increase in intracellular calcium levels can induce secretion of 5-HT from enteroendocrine cells in humans and mice, which can activate enteric nerves that innervate the small intestine and ultimately lead to increased intestinal motility"
    explanation: Demonstrates that rotavirus and NSP4 calcium signaling induce 5-HT release from enteroendocrine cells to activate small intestinal enteric nerves and increase motility.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus infection and NSP4-dependent 5-HT release can also activate vagal nerves that project to regions of the brain associated with nausea and vomiting"
    explanation: Shows that NSP4-dependent 5-HT release activates vagal afferent pathways projecting to brainstem emetic centers.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "This secondary component appears to involve the enteric nervous system and may be cyclic nucleotide dependent. Both phases of diarrhea occur in the absence of significant inflammation."
    explanation: Demonstrates that a secondary enteric nervous system component sustains the rotavirus diarrheal response without requiring overt mucosal inflammation.
  downstream:
  - target: Calcium-Activated Chloride Secretion
    description: Enteric secretomotor reflex activation sustains transepithelial chloride and water secretion across the small intestinal mucosa.
  - target: Vomiting
    description: Serotonin-mediated activation of vagal afferent pathways projecting to brainstem emetic centers induces acute vomiting.
  - target: Abdominal Pain
    description: Enteric nervous system activation and increased small intestinal motility cause cramping abdominal pain.

- name: Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction
  description: >-
    Rotavirus infection induces proteasome-dependent degradation of diacylglycerol
    O-acyltransferase 1 (DGAT1) and increases phosphorylation of eukaryotic translation
    initiation factor 2 alpha (eIF2alpha) in infected enterocytes. Loss of DGAT1 and
    global translational arrest downregulate apical brush-border enzymes (including
    lactase, sucrase, and maltase), disrupt enterocyte lipid droplet and membrane
    homeostasis, and cause cytolysis and desquamation of mature villus tip enterocytes
    with reactive crypt hyperplasia. Unabsorbed luminal disaccharides and solutes create
    an osmotic gradient that drives malabsorptive osmotic diarrhea.
  cell_types:
  - preferred_term: enterocyte of epithelium of small intestine
    term:
      id: CL:1000334
      label: enterocyte of epithelium of small intestine
  locations:
  - preferred_term: epithelium of small intestine
    term:
      id: UBERON:0001902
      label: epithelium of small intestine
  biological_processes:
  - preferred_term: cytolysis
    modifier: INCREASED
    term:
      id: GO:0019835
      label: cytolysis
  evidence:
  - reference: PMID:39548446
    reference_title: "A low-fat amino acid diet reverses intestinal failure and shows good growth trends in five infants with diacylglycerol transferase 1 (DGAT1) deficiency: a prospective cohort study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "As previously reported, in gastroenteritis caused by rotavirus (RV) infection, DGAT1 is degraded in RV-infected cells by a proteasome-dependent mechanism. DGAT1 loss reduces apical brush border enzymes which are required for normal enterocyte homeostasis."
    explanation: Shows that rotavirus infection triggers proteasome-dependent degradation of DGAT1, depleting apical brush-border enzymes required for enterocyte homeostasis.
  - reference: PMID:39548446
    reference_title: "A low-fat amino acid diet reverses intestinal failure and shows good growth trends in five infants with diacylglycerol transferase 1 (DGAT1) deficiency: a prospective cohort study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Eukaryotic translation initiation factor 2 alpha (eIF2α) is a regulator of global cellular translation, with increased phosphorylated eIF2α levels in RV-infected cells and human DGAT1−/− intestinal enteroids putatively responsible for downregulated protein expression which leads to malabsorptive diarrhea [24]."
    explanation: Links increased eIF2alpha phosphorylation and DGAT1 loss in rotavirus-infected enterocytes to downregulated brush-border protein expression and malabsorptive diarrhea.
  - reference: PMID:34431620
    reference_title: "European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be transient and related to the underlying condition."
    explanation: Establishes that rotaviral mucosal damage in infancy causes secondary lactase deficiency and transient carbohydrate malabsorption.
  downstream:
  - target: Secondary Lactase Deficiency and Carbohydrate Malabsorption
    description: Loss of mature villus enterocytes and proteasomal DGAT1 degradation deplete apical brush-border disaccharidases (particularly lactase), impairing lactose and carbohydrate digestion.
  - target: Malabsorptive Osmotic Diarrhea
    description: Depletion of apical brush-border disaccharidases and villus enterocyte loss leave unabsorbed luminal carbohydrates that drive osmotic diarrhea.
  - target: Dehydration
    description: Osmotic water retention in the gut lumen compounds secretory fluid losses to accelerate systemic dehydration.
phenotypes:
- name: Secretory Diarrhea
  category: Gastrointestinal
  frequency: VERY_FREQUENT
  diagnostic: true
  description: >-
    Profuse watery non-bloody diarrhea initiated by NSP4 enterotoxin-mediated
    intracellular calcium mobilization, apical chloride secretion, and enteric nervous
    system secretomotor activation.
  phenotype_term:
    preferred_term: Secretory diarrhea
    term:
      id: HP:0005208
      label: Secretory diarrhea
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Activation of these channels causes excessive secretion of chloride ions into the intestinal lumen, creating an osmotic gradient that facilitates the transport of water into the lumen, leading to secretory diarrhoea. Calcium-activated chloride channel inhibitors can prevent rotavirus-induced secretory diarrhoea in neonatal mice, supporting the role of NSP4 in the development of secretory diarrhoea"
    explanation: Establishes secretory diarrhea driven by calcium-activated chloride secretion as a core clinical manifestation of rotavirus infection.
  - reference: DOI:10.1152/ajpgi.2001.281.2.g303
    reference_title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
    supports: SUPPORT
    evidence_source: MODEL_ORGANISM
    quote_role: REVIEW_SYNTHESIS
    snippet: "In neonatal mouse pup mucosa models, ... leads to age-dependent halide ion movement across the plasma membrane, transepithelial Cl−secretion, and, unlike many microbial enterotoxins, initial cyclic nucleotide independence to secretory diarrhea."
    explanation: Documents secretory diarrhea driven by intracellular calcium elevation and transepithelial chloride secretion in rotavirus infection.
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."
    explanation: Confirms diarrhea as a cardinal clinical feature of pediatric rotaviral enteritis.

- name: Malabsorptive Osmotic Diarrhea
  category: Gastrointestinal
  frequency: FREQUENT
  description: >-
    Malabsorptive osmotic diarrhea resulting from proteasomal DGAT1 degradation,
    villus enterocyte destruction, and secondary brush-border disaccharidase (lactase)
    deficiency.
  phenotype_term:
    preferred_term: Osmotic diarrhea
    term:
      id: HP:0033310
      label: Osmotic diarrhea
  evidence:
  - reference: PMID:39548446
    reference_title: "A low-fat amino acid diet reverses intestinal failure and shows good growth trends in five infants with diacylglycerol transferase 1 (DGAT1) deficiency: a prospective cohort study."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Eukaryotic translation initiation factor 2 alpha (eIF2α) is a regulator of global cellular translation, with increased phosphorylated eIF2α levels in RV-infected cells and human DGAT1−/− intestinal enteroids putatively responsible for downregulated protein expression which leads to malabsorptive diarrhea [24]."
    explanation: Demonstrates that rotavirus-induced translational downregulation and DGAT1 loss cause malabsorptive diarrhea.
  - reference: PMID:34431620
    reference_title: "European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be transient and related to the underlying condition."
    explanation: Links rotaviral small intestinal mucosal injury to secondary lactase deficiency and osmotic carbohydrate malabsorption.

- name: Vomiting
  category: Gastrointestinal
  frequency: VERY_FREQUENT
  description: >-
    Acute forceful emesis mediated by NSP4-dependent serotonin release from
    enteroendocrine cells and vagal afferent signaling to the brainstem, frequently
    preceding or accompanying watery diarrhea and impairing oral fluid intake.
  phenotype_term:
    preferred_term: Vomiting
    term:
      id: HP:0002013
      label: Vomiting
  evidence:
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."
    explanation: Documents vomiting as one of the core presenting symptoms of rotavirus enteritis in children.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Rotavirus infection and NSP4-dependent 5-HT release can also activate vagal nerves that project to regions of the brain associated with nausea and vomiting"
    explanation: Explains the neurogenic mechanism of vomiting in rotavirus infection via 5-HT-dependent vagal nerve activation.

- name: Fever
  category: Systemic
  frequency: FREQUENT
  description: >-
    Acute febrile response accompanying the early phase of rotavirus replication and
    mucosal inflammation.
  phenotype_term:
    preferred_term: Fever
    term:
      id: HP:0001945
      label: Fever
  evidence:
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."
    explanation: Confirms high fever as a common clinical symptom in children with rotavirus enteritis.

- name: Dehydration
  category: Metabolic
  frequency: FREQUENT
  description: >-
    Isotonic or hypernatremic volume depletion caused by combined secretory and osmotic
    stool water losses compounded by emesis; the principal cause of shock, electrolyte
    imbalance, and mortality in untreated infants.
  phenotype_term:
    preferred_term: Dehydration
    term:
      id: HP:0001944
      label: Dehydration
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "In children, the manifestation of rotavirus disease ranges from no symptoms to mild, watery diarrhoea of short duration and to severe diarrhoea with vomiting and fever that can result in rapid dehydration with shock, electrolyte imbalance and death"
    explanation: Directly establishes rapid dehydration with shock and electrolyte imbalance as the principal life-threatening complication of pediatric rotavirus diarrhea and vomiting.

- name: Metabolic Acidosis
  category: Metabolic
  frequency: OCCASIONAL
  description: >-
    Normal-anion-gap (hyperchloremic) or mixed metabolic acidosis resulting from
    excessive fecal bicarbonate loss during acute rotaviral and secretory diarrhea and
    hypovolemic tissue hypoperfusion, corrected by base-containing oral or intravenous
    rehydration solutions.
  phenotype_term:
    preferred_term: Metabolic acidosis
    term:
      id: HP:0001942
      label: Metabolic acidosis
  evidence:
  - reference: PMID:8855579
    reference_title: "Oral rehydration therapy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Pathogens responsible for acute diarrhea include those which produce enterotoxin at the intestinal mucosal surface, inducing secretion but are not invasive (e.g., Vibrio cholerae); those which invade and disrupt the mucosal lining (e.g., shigella species); and rotavirus."
    explanation: Identifies rotavirus as one of the primary pathogens causing acute diarrheal fluid and electrolyte loss.
  - reference: PMID:8855579
    reference_title: "Oral rehydration therapy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "An ORS must have sufficient sodium to replace losses on a volume to volume basis, a glucose concentration that matches that of sodium to ensure its delivery to the ileum, sufficient amounts of potassium and base (e.g., sodium bicarbonate or trisodium citrate dihydrate) to correct acidosis and to enhance sodium absorption, and sufficient amounts of liquid."
    explanation: Documents metabolic acidosis as a core electrolyte disturbance of acute diarrheal dehydration requiring base replacement (bicarbonate or citrate) in oral rehydration solutions.

- name: Abdominal Pain
  category: Gastrointestinal
  frequency: FREQUENT
  description: >-
    Cramping abdominal pain and intestinal hypermotility associated with enteric
    nervous system activation and luminal distension.
  phenotype_term:
    preferred_term: Abdominal pain
    term:
      id: HP:0002027
      label: Abdominal pain
  evidence:
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Commonly, children with RV enteritis often have varying degrees of related clinical symptoms including high fever, vomiting, diarrhea, and abdominal pain."
    explanation: Establishes abdominal pain as a frequent symptom of pediatric rotaviral enteritis.

- name: Secondary Lactase Deficiency and Carbohydrate Malabsorption
  category: Gastrointestinal
  frequency: FREQUENT
  description: >-
    Transient secondary disaccharidase (lactase) deficiency and carbohydrate
    malabsorption caused by rotavirus-induced villus enterocyte destruction and
    proteasomal DGAT1 degradation in the small intestinal mucosa, which can prolong
    diarrheal duration in hospitalized infants fed lactose-containing formulas.
  phenotype_term:
    preferred_term: Malabsorption
    term:
      id: HP:0002024
      label: Malabsorption
  evidence:
  - reference: PMID:34431620
    reference_title: "European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Secondary lactase deficiency, due to damage to the small intestinal mucosa, may occur at any age and may be caused by infectious enteritis (i.e., Rotavirus, particularly in infancy), enteropathy (i.e., celiac disease, Giardiasis, and Crohn's disease), or severe malnutrition and may, thus, be transient and related to the underlying condition."
    explanation: Directly establishes that rotavirus enteritis in infancy damages the small intestinal mucosa to cause transient secondary lactase deficiency and carbohydrate malabsorption.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The administration of lactose-free formulas might reduce the duration of treatment and the risk of treatment failure143 and can be considered for selected children, such as those requiring hospitalization"
    explanation: Supports the clinical relevance of secondary lactose malabsorption in hospitalized children with severe rotavirus gastroenteritis.

- name: Elevated Hepatic Transaminases
  category: Hepatic
  frequency: OCCASIONAL
  description: >-
    Mild, transient elevation of serum alanine aminotransferase (ALT) and aspartate
    aminotransferase (AST) during acute rotavirus infection, reflecting systemic
    antigenemia/viremia and mild rotavirus-associated hepatitis or dehydration-related
    hepatic stress.
  phenotype_term:
    preferred_term: Elevated circulating hepatic transaminase concentration
    term:
      id: HP:0002910
      label: Elevated circulating hepatic transaminase concentration
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "For example, mildly increased levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in blood can sometimes be observed during rotavirus infection and might be due to rotavirus-induced mild hepatitis"
    explanation: Documents mild elevation of blood ALT and AST concentrations during acute rotavirus infection in children.
diagnosis:
- name: Stool Rotavirus Antigen Immunoassay
  description: >-
    Clinical laboratory confirmation of rotaviral enteritis is performed by detecting
    rotavirus group A antigen (primarily inner capsid protein VP6) in stool specimens
    using enzyme-linked immunosorbent assay (ELISA) or rapid lateral-flow
    immunochromatography.
  diagnosis_term:
    preferred_term: Diagnostic Procedure
    term:
      id: NCIT:C18020
      label: Diagnostic Procedure
  results: Detection of rotavirus antigen in feces confirms acute rotaviral enteritis.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "When a laboratory-confirmed diagnosis of rotavirus infection is requested by physicians in the clinical setting, rotavirus antigen can be detected in stools using enzyme-linked immunosorbent assay (ELISA) or immunochromatography. In vaccine and epidemiological studies, these assays are often complemented by the use of reverse transcription PCR (RT-PCR)-based assays, which are more sensitive and permit genotyping of virus isolates."
    explanation: Establishes stool antigen detection by ELISA or immunochromatography as the standard clinical diagnostic test for rotavirus infection.
- name: Stool Reverse Transcription Polymerase Chain Reaction (RT-PCR)
  description: >-
    Reverse transcription polymerase chain reaction (RT-PCR) on stool specimens
    provides high-sensitivity detection of rotavirus dsRNA and enables G (VP7) and P
    (VP4) genotyping to differentiate wild-type strains and vaccine viruses.
  diagnosis_term:
    preferred_term: Polymerase Chain Reaction
    term:
      id: NCIT:C17003
      label: Polymerase Chain Reaction
  results: Amplification of rotavirus RNA segments in stool with optional VP7 (G) and VP4 (P) genotyping.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "When a laboratory-confirmed diagnosis of rotavirus infection is requested by physicians in the clinical setting, rotavirus antigen can be detected in stools using enzyme-linked immunosorbent assay (ELISA) or immunochromatography. In vaccine and epidemiological studies, these assays are often complemented by the use of reverse transcription PCR (RT-PCR)-based assays, which are more sensitive and permit genotyping of virus isolates."
    explanation: Establishes RT-PCR of stool specimens as a higher-sensitivity diagnostic method that also enables G and P genotyping of rotavirus isolates.
genetic:
- name: FUT2
  association: Susceptibility and Oral Rotavirus Vaccine Response Modifier
  relationship_type: SUSCEPTIBILITY
  gene_term:
    preferred_term: FUT2
    term:
      id: hgnc:4013
      label: FUT2
  notes: >-
    FUT2 encodes galactoside 2-alpha-L-fucosyltransferase 2, which controls synthesis
    of H type 1 histo-blood group antigens (HBGAs) on small intestinal enterocytes and
    in mucosal secretions ("secretor" status). Because P[8] and P[4] rotavirus VP8*
    spike domains bind secretor HBGAs for attachment, FUT2 secretors have significantly
    higher susceptibility to P[8] and P[4] wild-type rotavirus gastroenteritis than
    non-secretors, whereas homozygous FUT2 non-secretors show natural resistance to P[8]
    strains and markedly reduced IgA seroconversion ("vaccine take") following oral
    live-attenuated G1P[8] rotavirus vaccination.
  evidence:
  - reference: PMID:32992488
    reference_title: "FUT2 Secretor Status Influences Susceptibility to VP4 Strain-Specific Rotavirus Infections in South African Children"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Rotavirus-positive cases (RV+) comprised 74% (185/250) secretors (Se) and 26% (65/250) non-secretors, while rotavirus-negative controls (RV-) comprised 58% (144/250) secretors and 42% (106/250) non-secretors. The distributions of secretors versus non-secretors observed amongst cases and controls were significantly different (p < 0.001)."
    explanation: Directly demonstrates in children with rotavirus gastroenteritis that FUT2 secretor status significantly increases susceptibility to rotavirus infection compared with non-secretors.
  - reference: PMID:28329092
    reference_title: "Secretor and Salivary ABO Blood Group Antigen Status Predict Rotavirus Vaccine Take in Infants."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate synthesized by FUT2), an intermediate rate (30%) among secretors with non-blood group O, and the highest rate (51%) among secretors with O blood group."
    explanation: Directly demonstrates that infants who are FUT2 nonsecretors have the lowest anti-rotavirus IgA seroconversion rate ("vaccine take") after oral G1P[8] rotavirus vaccination.
treatments:
- name: Oral Rehydration Therapy
  description: >-
    First-line supportive therapy consists of reduced-osmolarity (245 mOsm/L) oral
    rehydration salts (ORS) containing equimolar glucose (75 mmol/L) and sodium
    (75 mEq/L) plus potassium and base (citrate or bicarbonate), exploiting preserved
    SGLT1-mediated glucose-coupled sodium and water absorption across uninfected small
    intestinal enterocytes to prevent and reverse dehydration and metabolic acidosis.
  therapeutic_modality: SMALL_MOLECULE
  treatment_term:
    preferred_term: Fluid Therapy
    term:
      id: NCIT:C116537
      label: Fluid Therapy
    therapeutic_agent:
    - preferred_term: sodium chloride
      term:
        id: CHEBI:26710
        label: sodium chloride
    - preferred_term: D-glucose
      term:
        id: CHEBI:17234
        label: glucose
  target_phenotypes:
  - preferred_term: Dehydration
    term:
      id: HP:0001944
      label: Dehydration
  - preferred_term: Metabolic acidosis
    term:
      id: HP:0001942
      label: Metabolic acidosis
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "One of the most important medical advancements in the past 50 years that has saved millions of infant lives was that administration of ORS resulted in glucose-coupled sodium and water absorption in the small intestine137. Oral rehydration therapy has been used safely and successfully to prevent and treat dehydration due to diarrhoeal pathogens, including rotavirus, in infants and young children"
    explanation: Establishes oral rehydration salts (ORS) as the cornerstone therapy that drives glucose-coupled sodium and water absorption in the small intestine to prevent and treat rotavirus dehydration.
  - reference: PMID:21359029
    reference_title: "Oral rehydration salts, zinc supplement and rota virus vaccine in the management of childhood acute diarrhea"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "The efficacy of ORS solution for the treatment of children with acute non-cholera diarrhea has improved with the reduction of its sodium concentration to 75 mEq/l, its glucose concentration to 75 mmol/l, and its total osmolarity to 245 mOsm/l"
    explanation: Documents the improved clinical efficacy of reduced-osmolarity (245 mOsm/L) oral rehydration solution containing 75 mEq/L sodium and 75 mmol/L glucose in childhood acute non-cholera diarrhea.
  - reference: PMID:8855579
    reference_title: "Oral rehydration therapy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "An ORS must have sufficient sodium to replace losses on a volume to volume basis, a glucose concentration that matches that of sodium to ensure its delivery to the ileum, sufficient amounts of potassium and base (e.g., sodium bicarbonate or trisodium citrate dihydrate) to correct acidosis and to enhance sodium absorption, and sufficient amounts of liquid."
    explanation: Explains how sodium, equimolar glucose, potassium, and base in oral rehydration solutions replace volume losses and correct metabolic acidosis.

- name: Zinc Supplementation
  description: >-
    Oral zinc supplementation (10-20 mg daily for 10-14 days) administered as an adjunct
    to oral rehydration therapy restores intestinal mucosal barrier integrity, reduces
    stool output, and shortens the duration of diarrhea, vomiting, and fever in children
    with rotaviral enteritis, particularly in low-income settings with a high burden of
    malnutrition.
  therapeutic_modality: SMALL_MOLECULE
  treatment_term:
    preferred_term: Pharmacotherapy
    term:
      id: NCIT:C15986
      label: Pharmacotherapy
    therapeutic_agent:
    - preferred_term: zinc sulfate
      term:
        id: CHEBI:35176
        label: zinc sulfate
  target_phenotypes:
  - preferred_term: Secretory diarrhea
    term:
      id: HP:0005208
      label: Secretory diarrhea
  evidence:
  - reference: PMID:37842003
    reference_title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Conventional therapy combined with the zinc preparation significantly shortened the duration of hyperthermia, vomiting, and diarrhea compared with the conventional treatment alone."
    explanation: Demonstrates that adding oral zinc supplementation to conventional therapy significantly shortens the duration of fever, vomiting, and diarrhea in pediatric rotavirus enteritis.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "In addition, zinc supplementation can improve the outcome of acute diarrhoea in low-income regions, in which malnutrition is common."
    explanation: Confirms that oral zinc supplementation improves clinical outcomes of acute rotaviral and childhood diarrhea in settings where malnutrition is prevalent.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "For children living in low-income regions, the WHO recommends daily zinc supplementation for infants and children for 10–14 days, starting as soon as the diarrhoea episode has been diagnosed"
    explanation: Documents the WHO recommendation for a 10-14 day course of daily zinc supplementation initiated at diagnosis of childhood diarrhea.

- name: Rotavirus Vaccination
  description: >-
    Oral live-attenuated rotavirus vaccination—including monovalent human attenuated
    G1P[8] vaccine (RV1, Rotarix) and pentavalent bovine-human reassortant G1, G2, G3,
    G4, P1A[8] vaccine (RV5, RotaTeq)—administered in early infancy induces intestinal
    secretory IgA and homotypic and heterotypic serum neutralizing antibodies targeting
    the outer capsid proteins VP7 and VP4 (VP8*/VP5*) as well as non-neutralizing
    mucosal anti-VP6 and anti-NSP4 immunity. Mucosal and systemic immunity blocks viral
    attachment and entry into villus enterocytes and neutralizes NSP4 enterotoxin
    activity, preventing severe dehydrating secretory and malabsorptive gastroenteritis.
  therapeutic_modality: VACCINE
  treatment_term:
    preferred_term: Vaccination
    term:
      id: NCIT:C15346
      label: Vaccination
    therapeutic_agent:
    - preferred_term: Rotavirus Vaccine
      term:
        id: NCIT:C96394
        label: Rotavirus Vaccine
  target_mechanisms:
  - target: Host Glycan Attachment and Mature Villus Enterocyte Entry
    treatment_effect: INHIBITS
    description: >-
      Vaccine-induced mucosal secretory IgA and homotypic and heterotypic neutralizing
      antibodies against VP4 (VP8*/VP5*) and VP7 block viral attachment to enterocyte
      HBGAs and prevent host cell entry, while intracellular polymeric IgA transcytosis
      via pIgR intercepts double-layered particles via VP6.
    evidence:
    - reference: PMID:29119972
      reference_title: "Rotavirus infection"
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      snippet: "vaccines can induce protection against other rotavirus strains with different P-types and G-types (that is, heterotypic responses)90, heterotypic neutralizing antibodies (either anti-VP4 antibodies or anti-VP7 antibodies) might have important roles in protection against rotavirus disease."
      explanation: Demonstrates that rotavirus vaccines elicit heterotypic neutralizing anti-VP4 and anti-VP7 antibodies that block viral attachment and entry across diverse G and P genotypes.
  - target: NSP4 Viroporin-Mediated Intracellular Calcium Mobilization
    treatment_effect: INHIBITS
    description: >-
      By preventing productive enterocyte infection and eliciting mucosal IgA and
      neutralizing immunity, vaccination prevents downstream NSP4 enterotoxin-driven
      calcium mobilization and secretory chloride loss.
    evidence:
    - reference: PMID:29119972
      reference_title: "Rotavirus infection"
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      snippet: "Rotavirus primarily infects enterocytes and induces diarrhoea through the destruction of absorptive enterocytes (leading to malabsorption), intestinal secretion stimulated by rotavirus non-structural protein 4 and activation of the enteric nervous system."
      explanation: Establishes that rotavirus infection of enterocytes drives NSP4-stimulated intestinal secretion, which vaccine-induced mucosal immunity prevents upstream.
    - reference: PMID:29119972
      reference_title: "Rotavirus infection"
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: MODEL_ORGANISM
      quote_role: REVIEW_SYNTHESIS
      snippet: "In adult mice, protection from rotavirus reinfection is almost absolute and is mostly mediated by intestinal IgA antibodies90, the production of which is largely dependent on the activation of CD4+ T cells"
      explanation: Demonstrates that CD4+ T-cell-dependent intestinal IgA antibodies protect against productive rotavirus infection and its downstream enterotoxigenic sequelae.
  - target: Proteasomal DGAT1 Degradation and Villus Enterocyte Destruction
    treatment_effect: INHIBITS
    description: >-
      Prevention of extensive villus enterocyte infection by vaccine-elicited mucosal
      immunity preserves DGAT1 expression, apical brush-border disaccharidase activity,
      and mucosal architecture.
    evidence:
    - reference: PMID:29119972
      reference_title: "Rotavirus infection"
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      snippet: "Rotavirus primarily infects enterocytes and induces diarrhoea through the destruction of absorptive enterocytes (leading to malabsorption), intestinal secretion stimulated by rotavirus non-structural protein 4 and activation of the enteric nervous system."
      explanation: Identifies destruction of absorptive enterocytes and resulting malabsorption as core consequences of rotavirus infection that vaccination prevents.
    - reference: PMID:29119972
      reference_title: "Rotavirus infection"
      supports: SUPPORT
      directness: INDIRECT
      evidence_source: HUMAN_CLINICAL
      quote_role: REVIEW_SYNTHESIS
      snippet: "Both vaccines are highly effective in preventing severe rotavirus disease in high-income countries117 but reduce the incidence of severe rotavirus disease by ~50–60% in many low-income countries"
      explanation: Demonstrates that rotavirus vaccination prevents severe rotavirus gastroenteritis and associated absorptive enterocyte destruction in human populations.
  effect_modifiers:
  - effect_modifier_type: GENOTYPE
    stratum: "FUT2 non-secretor (se/se) infants"
    comparator_stratum: "FUT2 secretor infants (especially blood group O secretors)"
    modified_outcome: "Oral P[8]-based live-attenuated rotavirus vaccine replication and anti-rotavirus IgA seroconversion (vaccine take)"
    effect_in_stratum: SMALLER_EFFECT
    description: >-
      Because live-attenuated oral rotavirus vaccines containing P[8] VP4 spikes rely
      on FUT2-dependent H type 1 mucosal glycans to attach to and replicate in small
      intestinal enterocytes, FUT2 non-secretor status markedly reduces vaccine
      replication and anti-rotavirus IgA seroconversion ("take") while also conferring
      baseline genetic resistance to homotypic P[8] wild-type strains.
    evidence:
    - reference: PMID:28329092
      reference_title: "Secretor and Salivary ABO Blood Group Antigen Status Predict Rotavirus Vaccine Take in Infants."
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate synthesized by FUT2), an intermediate rate (30%) among secretors with non-blood group O, and the highest rate (51%) among secretors with O blood group."
      explanation: Directly shows in a clinical trial of oral G1P[8] rotavirus vaccine that FUT2 non-secretor infants have significantly lower IgA seroconversion (19%) than secretor infants (30-51%).
  notes: >-
    Contraindicated in infants with severe combined immunodeficiency (SCID) due to risk
    of prolonged vaccine-strain viral shedding and severe gastroenteritis, and in
    infants with a history of intussusception.
  evidence:
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Two rotavirus vaccines are broadly used worldwide: the RV5 vaccine, RotaTeq (Merck, USA), and the RV1 vaccine, Rotarix (GlaxoSmithKline, Belgium). The RV5 vaccine is a live attenuated, pentavalent vaccine, which is composed of five bovine–human reassortant rotaviruses that express either human VP4 or VP7 from rotavirus strains G1, G2, G3, G4"
    explanation: Characterizes the two globally used live-attenuated oral rotavirus vaccines, RV5 (RotaTeq) and RV1 (Rotarix), including the pentavalent bovine-human reassortant VP4 and VP7 antigens of RV5.
  - reference: PMID:29119972
    reference_title: "Rotavirus infection"
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    quote_role: REVIEW_SYNTHESIS
    snippet: "Both vaccines are highly effective in preventing severe rotavirus disease in high-income countries117 but reduce the incidence of severe rotavirus disease by ~50–60% in many low-income countries"
    explanation: Documents clinical effectiveness of RV1 and RV5 oral rotavirus vaccines against severe rotavirus gastroenteritis across high- and low-income settings.
  - reference: PMID:28329092
    reference_title: "Secretor and Salivary ABO Blood Group Antigen Status Predict Rotavirus Vaccine Take in Infants."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "rotavirus vaccine trial who were seronegative at baseline, anti-rotavirus immunoglobulin A seroconversion rates after 3 vaccine doses differed significantly by salivary HBGA phenotype, with the lowest rate (19%) among infants who were nonsecretors (ie, who did not express the carbohydrate synthesized by FUT2), an intermediate rate (30%) among secretors with non-blood group O, and the highest rate (51%) among secretors with O blood group."
    explanation: Demonstrates that host FUT2 secretor status and salivary ABO blood group phenotype govern mucosal IgA seroconversion to oral G1P[8] rotavirus vaccination.
  - reference: PMID:20674876
    reference_title: "Severe combined immunodeficiency (SCID) and rotavirus vaccination: reports to the Vaccine Adverse Events Reporting System (VAERS)."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Postmarketing reports have described severe gastroenteritis with vaccine viral shedding in infants who received rotavirus vaccine and were later diagnosed with SCID. The US Food and Drug Administration recently approved labeling changes for RotaTeq and Rotarix contraindicating administration to individuals with a history of SCID."
    explanation: Directly supports the contraindication of RotaTeq and Rotarix in infants with severe combined immunodeficiency (SCID) due to vaccine-strain viral shedding and severe gastroenteritis.
notes: >-
  Extraintestinal clinical associations reported during acute rotavirus infection (such
  as benign convulsions with mild gastroenteritis or biliary atresia) lack established
  direct causal links to antigenemia in human cohorts (PMID:29119972) and are omitted
  from the causal pathograph.
references:
- reference: DOI:10.1152/ajpgi.2001.281.2.g303
  title: "VIII. Pathological consequences of rotavirus infection and its enterotoxin"
  findings: []
- reference: PMID:8855579
  title: "Oral rehydration therapy."
  findings: []
- reference: PMID:20674876
  title: "Severe combined immunodeficiency (SCID) and rotavirus vaccination: reports to the Vaccine Adverse Events Reporting System (VAERS)."
  findings: []
- reference: PMID:21359029
  title: "Oral rehydration salts, zinc supplement and rota virus vaccine in the management of childhood acute diarrhea"
  findings: []
- reference: PMID:28329092
  title: "Secretor and Salivary ABO Blood Group Antigen Status Predict Rotavirus Vaccine Take in Infants."
  findings: []
- reference: PMID:29119972
  title: "Rotavirus infection"
  findings: []
- reference: PMID:32992488
  title: "FUT2 Secretor Status Influences Susceptibility to VP4 Strain-Specific Rotavirus Infections in South African Children"
  findings: []
- reference: PMID:34431620
  title: "European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus."
  findings: []
- reference: PMID:37842003
  title: "Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis."
  findings: []
- reference: PMID:39548446
  title: "A low-fat amino acid diet reverses intestinal failure and shows good growth trends in five infants with diacylglycerol transferase 1 (DGAT1) deficiency: a prospective cohort study."
  findings: []

📚

References & Deep Research

References

10

DOI:10.1152/ajpgi.2001.281.2.g303

VIII. Pathological consequences of rotavirus infection and its enterotoxin

No top-level findings curated for this source.

PMID:8855579

Oral rehydration therapy.

No top-level findings curated for this source.

PMID:20674876

Severe combined immunodeficiency (SCID) and rotavirus vaccination: reports to the Vaccine Adverse Events Reporting System (VAERS).

No top-level findings curated for this source.

PMID:21359029

Oral rehydration salts, zinc supplement and rota virus vaccine in the management of childhood acute diarrhea

No top-level findings curated for this source.

PMID:28329092

Secretor and Salivary ABO Blood Group Antigen Status Predict Rotavirus Vaccine Take in Infants.

No top-level findings curated for this source.

PMID:29119972

Rotavirus infection

No top-level findings curated for this source.

PMID:32992488

FUT2 Secretor Status Influences Susceptibility to VP4 Strain-Specific Rotavirus Infections in South African Children

No top-level findings curated for this source.

PMID:34431620

European guideline on indications, performance, and clinical impact of hydrogen and methane breath tests in adult and pediatric patients: European Association for Gastroenterology, Endoscopy and Nutrition, European Society of Neurogastroenterology and Motility, and European Society for Paediatric Gastroenterology Hepatology and Nutrition consensus.

No top-level findings curated for this source.

PMID:37842003

Characterization of changes in the intestinal microbiome following combination therapy with zinc preparation and conventional treatment for children with rotavirus enteritis.

No top-level findings curated for this source.

PMID:39548446

A low-fat amino acid diet reverses intestinal failure and shows good growth trends in five infants with diacylglycerol transferase 1 (DGAT1) deficiency: a prospective cohort study.

No top-level findings curated for this source.

Rotaviral Enteritis

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