Brucellosis

Infectious MONDO:0005683 Pathograph 9 zoonotic bacterial infection primary bacterial infectious disease

Brucellosis is a zoonotic bacterial infection caused by Brucella species, typically acquired through exposure to infected animals, contaminated animal products, or unpasteurized dairy products. Clinical illness often presents as a systemic febrile syndrome and may relapse or involve focal complications.

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0
Mappings
1
Definitions
0
Inheritance
4
Pathophysiology
0
Histopathology
7
Phenotypes
9
Pathograph
0
Genes
4
Treatments
0
Subtypes
0
Differentials
0
Datasets
0
Trials
0
Models
1
Deep Research
🏷

Classifications

Harrison's Chapter
infectious disease bacterial infectious disease
📘

Definitions

1
Clinical syndrome definition
Brucellosis is a zoonotic Brucella infection with non-specific systemic symptoms such as fever, fatigue, and joint pain, and can cause focal complications including endocarditis and arthritis.
CASE_DEFINITION Human brucellosis clinical syndrome
Show evidence (2 references)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Defines the core symptom complex and examples of clinically important complications.
DOI:10.1097/QCO.0000000000001045 SUPPORT Other
"Given the global prevalence and potential complications of brucellosis, understanding recent advancements in diagnostic techniques and treatment strategies is crucial for clinicians."
Supports the global and complicated clinical scope of brucellosis.
⚙

Pathophysiology

4
Intracellular macrophage survival
Brucella can survive inside macrophages, establishing an intracellular niche that supports persistence and immune evasion.
macrophage link
defense response to Gram-negative bacterium link ↕ DYSREGULATED
Downstream
MHC-I surface down-modulation Intracellular infection context is linked to reduced MHC-I surface expression and impaired CD8+ T-cell surveillance.
Show evidence (1 reference)
DOI:10.1371/journal.pone.0306429 SUPPORT In Vitro
"Brucella abortus (Ba) is a pathogen that survives inside macrophages."
Supports macrophage intracellular survival as a core Brucella pathogenesis feature.
MHC-I surface down-modulation
Brucella abortus RNA reduces IFN-gamma-induced surface MHC-I expression in epithelial, endothelial, and monocyte/macrophage contexts.
bronchial epithelial cell link endothelial cell link monocyte link macrophage link
antigen processing and presentation link ↓ DECREASED
Downstream
Persistent multisystem infection Impaired MHC-I surface expression may help Brucella persist by reducing CD8+ T-cell surveillance.
Show evidence (2 references)
DOI:10.1371/journal.pone.0306429 SUPPORT In Vitro
"Here, we demonstrate that Ba RNA reduced the surface expression of MHC-I induced by IFN-γ in the human bronchial epithelium (Calu-6), the human alveolar epithelium (A-549) and the endothelial microvasculature (HMEC) cell lines."
Supports MHC-I surface down-modulation in non-myeloid human cell models.
DOI:10.1371/journal.pone.0306429 SUPPORT In Vitro
"In addition, we showed that Ba RNA down-modulates the MHC-I surface expression induced by IFN-γ on human monocytes/macrophages via the pathway of the Epidermal Growth Factor Receptor (EGFR)."
Supports MHC-I down-modulation in monocytes/macrophages and implicates EGFR pathway involvement.
Pro-inflammatory cytokine induction in epithelial and endothelial cells
Brucella abortus RNA can increase IL-8 and IL-6 secretion in epithelial and endothelial cell models.
epithelial cell link endothelial cell link
regulation of cytokine production link ↑ INCREASED inflammatory response link ↑ INCREASED
Downstream
Fever Inflammatory cytokine signaling contributes to systemic febrile illness.
Show evidence (1 reference)
DOI:10.1371/journal.pone.0306429 SUPPORT In Vitro
"Contrary to our expectations, HMEC, Calu-6 and A-549 cells treated with Ba RNA had higher IL-8 and IL-6 levels compared to untreated cells."
Supports cytokine induction in epithelial and endothelial cell lines after Brucella RNA exposure.
Persistent multisystem infection
Brucellosis involves difficult-to-clear infection requiring prolonged combination therapy to clear infection and prevent relapse.
defense response to bacterium link ↕ DYSREGULATED
Show evidence (1 reference)
DOI:10.1038/s41598-024-69669-w SUPPORT Human Clinical
"Brucellosis is a difficult to treat infection that requires antibiotic combinations administered over several weeks for clearance of infection and relapse prevention."
Supports persistent, relapse-prone infection as a clinical pathophysiology node.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Brucellosis Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.
●

Phenotypes

7
Cardiovascular 1
Hepatosplenomegaly Hepatosplenomegaly (HP:0001433)
Show evidence (1 reference)
DOI:10.1186/s43088-024-00569-8 SUPPORT Human Clinical
"Substantial risks of miscarriage (25%), preterm birth (20%), hepatosplenomegaly (10%), febrile illness (30%), and possible long-term complications were documented."
Supports hepatosplenomegaly as a documented complication in maternal-child brucellosis literature.
Metabolism 1
Fever Fever (HP:0001945)
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Directly supports fever as a brucellosis symptom.
Musculoskeletal 1
Arthritis Arthritis (HP:0001369)
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Supports arthritis as a brucellosis complication.
Constitutional 2
Fatigue Fatigue (HP:0012378)
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Directly supports fatigue as a brucellosis symptom.
Joint pain Arthralgia (HP:0002829)
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Directly supports joint pain as a brucellosis symptom.
Other 2
Endocarditis Endocarditis (HP:0100584)
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
Supports endocarditis as a brucellosis complication.
Maternal-fetal complications
Show evidence (1 reference)
DOI:10.1186/s43088-024-00569-8 SUPPORT Human Clinical
"This review reveals the alarming yet hidden toll brucellosis takes on maternal–fetal pairs and breastfeeding."
Supports maternal-fetal and breastfeeding contexts as clinically important brucellosis manifestations.
💊

Treatments

4
Doxycycline-rifampicin combination therapy
Action: pharmacotherapy MAXO:0000058
Agent: doxycycline ↗ rifampicin ↗
Standard oral dual antibiotic therapy used for uncomplicated human brucellosis and bacteremic disease, though relapse risk can be higher than with some aminoglycoside-containing regimens.
Mechanism Target:
INHIBITS Persistent multisystem infection — Combination antibiotic therapy targets clearance of persistent infection and prevention of relapse.
Show evidence (1 reference)
DOI:10.1038/s41598-024-69669-w SUPPORT Human Clinical
"Brucellosis is a difficult to treat infection that requires antibiotic combinations administered over several weeks for clearance of infection and relapse prevention."
Supports using prolonged combination therapy to clear infection and reduce relapse.
Show evidence (2 references)
DOI:10.1038/s41598-024-69669-w SUPPORT Human Clinical
"However, the latter is also efficacious and suitable for uncomplicated disease."
In context, supports doxycycline-rifampicin as an efficacious uncomplicated-disease option despite better outcomes for some triple therapies.
DOI:10.37723/jumdc.v15i3.920 SUPPORT Human Clinical
"CONCLUSION: Oral doxycycline-rifampicin (DR) and IV gentamicin-doxycycline-rifampicin (GDR) regimens have similar response rates in bacteremia brucellosis."
Supports oral doxycycline-rifampicin as a bacteremic brucellosis regimen in an observational comparison.
Doxycycline-streptomycin combination therapy
Action: pharmacotherapy MAXO:0000058
Agent: doxycycline ↗ streptomycin ↗
Aminoglycoside-containing combination therapy with evidence of superior efficacy compared with doxycycline-rifampicin in network meta-analyses.
Mechanism Target:
INHIBITS Persistent multisystem infection — Aminoglycoside-containing doxycycline therapy is used to improve clearance and reduce relapse risk.
Show evidence (1 reference)
DOI:10.1371/journal.pntd.0012010 SUPPORT Human Clinical
"This review confirmed the superiority of drugs already indicated for treating human brucellosis, such as the combination of doxycycline and aminoglycosides."
Supports an aminoglycoside-containing doxycycline regimen as a superior brucellosis treatment strategy.
Show evidence (2 references)
DOI:10.1371/journal.pntd.0012405 SUPPORT Human Clinical
"Brucellosis medications differ in efficacy and safety. Doxycycline + Gentamicin, Triple, and Doxycycline + Streptomycin have superior efficacy and safety."
Supports doxycycline-streptomycin as a high-performing regimen class.
DOI:10.1038/s41598-024-69669-w SUPPORT Human Clinical
"Triple antibiotic therapy is more effective than standard dual therapy with rifampicin and doxycycline."
Supports intensifying beyond standard dual therapy for improved treatment outcomes.
Doxycycline-gentamicin combination therapy
Action: pharmacotherapy MAXO:0000058
Agent: doxycycline ↗ gentamicin ↗
Aminoglycoside-containing combination therapy ranked highest for efficacy in a 2024 network meta-analysis of randomized trials.
Mechanism Target:
INHIBITS Persistent multisystem infection — Doxycycline-gentamicin therapy is used to improve infection clearance and prevent treatment failure.
Show evidence (1 reference)
DOI:10.1371/journal.pntd.0012405 SUPPORT Human Clinical
"Doxycycline + Gentamicin ranked the best in efficacy (SUCRA values: 0.94), the second is Triple (SUCRA values: 0.87), and the third is Doxycycline + Streptomycin (SUCRA values: 0.78)."
Supports doxycycline-gentamicin as the top-ranked efficacy regimen in the network meta-analysis.
Show evidence (1 reference)
DOI:10.1371/journal.pntd.0012405 SUPPORT Human Clinical
"Doxycycline + Gentamicin ranked the best in efficacy (SUCRA values: 0.94), the second is Triple (SUCRA values: 0.87), and the third is Doxycycline + Streptomycin (SUCRA values: 0.78)."
Supports doxycycline-gentamicin as a high-efficacy brucellosis regimen.
Doxycycline-streptomycin-hydroxychloroquine triple therapy
Action: pharmacotherapy MAXO:0000058
Agent: doxycycline ↗ streptomycin ↗ hydroxychloroquine ↗
Emerging triple therapy identified as a potential strategy to reduce overall therapy failure, with very low-certainty evidence requiring confirmation.
Mechanism Target:
INHIBITS Persistent multisystem infection — Hydroxychloroquine-containing triple therapy may reduce treatment failure, but evidence remains low certainty and investigational.
Show evidence (1 reference)
DOI:10.1371/journal.pntd.0012010 PARTIAL Human Clinical
"The association of hydroxychloroquine to the dual regimen was identified as a potential strategy to prevent overall therapy failure, which is subject to confirmation in future studies."
Supports the regimen as a promising but not yet definitive treatment strategy.
Show evidence (1 reference)
DOI:10.1371/journal.pntd.0012010 PARTIAL Human Clinical
"The association of hydroxychloroquine to the dual regimen was identified as a potential strategy to prevent overall therapy failure, which is subject to confirmation in future studies."
Conservatively supports hydroxychloroquine triple therapy as emerging/partial evidence pending confirmation.
🌍

Environmental Factors

3
Livestock-dependent setting
Livestock-dependent regions have higher exposure opportunity for zoonotic Brucella transmission.
Show evidence (1 reference)
DOI:10.21203/rs.3.rs-4929733/v1 SUPPORT Human Clinical
"Human brucellosis caused by various Brucella species is a significant global health concern, particularly in livestock-dependent regions."
Supports livestock dependence as an epidemiologic exposure context.
Maternal livestock exposure
Livestock exposure is a documented acquisition route among vulnerable maternal groups.
Show evidence (1 reference)
DOI:10.1186/s43088-024-00569-8 SUPPORT Human Clinical
"Key findings demonstrate that zoonotic brucellosis acquisition from livestock exposures among vulnerable maternal groups accounts for up to 70% of cases."
Supports livestock exposure as a maternal risk context.
Inadequate One Health control infrastructure
Weak surveillance, diagnostic, veterinary, and public-health infrastructure can impair brucellosis control in endemic settings.
Show evidence (2 references)
DOI:10.3390/microorganisms11082070 SUPPORT Other
"Brucellosis One Health actors include Public Health and Veterinary Services, microbiologists, medical and veterinary practitioners and breeders."
Supports multidisciplinary One Health control context.
DOI:10.3390/microorganisms11082070 SUPPORT Other
"Extended infrastructural weaknesses, often accentuated by geography and climate, are critically important."
Supports infrastructure as a risk modifier for brucellosis control.
{ }

Source YAML

click to show 
name: Brucellosis
creation_date: "2026-05-08T13:18:32Z"
updated_date: "2026-05-08T14:06:38Z"
category: Infectious
description: >-
  Brucellosis is a zoonotic bacterial infection caused by Brucella species,
  typically acquired through exposure to infected animals, contaminated animal
  products, or unpasteurized dairy products. Clinical illness often presents as
  a systemic febrile syndrome and may relapse or involve focal complications.
disease_term:
  preferred_term: brucellosis
  term:
    id: MONDO:0005683
    label: brucellosis
classifications:
  harrisons_chapter:
  - classification_value: infectious disease
    evidence:
    - reference: DOI:10.1371/journal.pntd.0012442
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Brucellosis, a zoonotic infectious disease caused by bacteria of the genus Brucella, remains a significant global health concern in many parts of the world."
      explanation: Supports classification as a zoonotic infectious disease.
  - classification_value: bacterial infectious disease
    evidence:
    - reference: DOI:10.21203/rs.3.rs-4929733/v1
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Human brucellosis caused by various Brucella species is a significant global health concern, particularly in livestock-dependent regions."
      explanation: Supports bacterial infectious disease classification and global disease scope.
definitions:
- name: Clinical syndrome definition
  definition_type: CASE_DEFINITION
  description: >-
    Brucellosis is a zoonotic Brucella infection with non-specific systemic
    symptoms such as fever, fatigue, and joint pain, and can cause focal
    complications including endocarditis and arthritis.
  scope: Human brucellosis clinical syndrome
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Defines the core symptom complex and examples of clinically important complications.
  - reference: DOI:10.1097/QCO.0000000000001045
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Given the global prevalence and potential complications of brucellosis, understanding recent advancements in diagnostic techniques and treatment strategies is crucial for clinicians."
    explanation: Supports the global and complicated clinical scope of brucellosis.
parents:
- zoonotic bacterial infection
- primary bacterial infectious disease
synonyms:
- undulant fever
- Malta fever
- Mediterranean flaccid fever
prevalence:
- population: Global literature meta-analysis
  percentage: "15.49% pooled prevalence among included study populations"
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The pooled prevalence of brucellosis was 15.49% (95% CI: 12.01–18.97), with the highest prevalence observed in Palestine (76%) and the lowest in Brazil (0.64%)."
    explanation: Provides a meta-analytic prevalence estimate for the sampled human brucellosis literature.
- population: Culture-confirmed cases in Israel, 2004-2022
  percentage: "1.6 per 100,000 average annual incidence overall"
  evidence:
  - reference: DOI:10.1017/S0950268824000803
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The average annual incidence rates overall and for the Arab, Druze, and Jewish sectors were 1.6/100,000, 6.6/100,000, 5.5/100,000, and 0.18/100,000, respectively."
    explanation: Provides population-specific incidence data from a national culture-confirmed series.
infectious_agent:
- name: Brucella species
  infectious_agent_term:
    preferred_term: Brucella
    term:
      id: NCBITaxon:234
      label: Brucella
  description: Facultative intracellular bacterial genus that causes human brucellosis.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012442
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucellosis, a zoonotic infectious disease caused by bacteria of the genus Brucella, remains a significant global health concern in many parts of the world."
    explanation: Identifies Brucella as the causative bacterial genus.
- name: Brucella abortus
  infectious_agent_term:
    preferred_term: Brucella abortus
    term:
      id: NCBITaxon:235
      label: Brucella abortus
  description: A Brucella species used in contemporary immune-evasion mechanistic studies.
  evidence:
  - reference: DOI:10.1371/journal.pone.0306429
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Brucella abortus (Ba) is a pathogen that survives inside macrophages."
    explanation: Supports B. abortus as a disease-relevant Brucella species in host-cell infection models.
- name: Brucella melitensis
  infectious_agent_term:
    preferred_term: Brucella melitensis
    term:
      id: NCBITaxon:29459
      label: Brucella melitensis
  description: Dominant Brucella species in a national culture-confirmed human brucellosis series from Israel.
  evidence:
  - reference: DOI:10.1017/S0950268824000803
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucella melitensis was the dominant species (99.6%)."
    explanation: Supports B. melitensis as a major causative species in culture-confirmed human brucellosis.
transmission:
- name: Livestock-associated zoonotic exposure
  description: Brucellosis is acquired from animal reservoirs and contaminated animal environments, especially in livestock-dependent regions.
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Human brucellosis caused by various Brucella species is a significant global health concern, particularly in livestock-dependent regions."
    explanation: Supports livestock-associated exposure as a central epidemiologic context.
- name: Maternal and vertical transmission contexts
  description: Maternal brucellosis can involve livestock exposure and vertical transmission during pregnancy, delivery, or breastfeeding.
  evidence:
  - reference: DOI:10.1186/s43088-024-00569-8
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Vertical transmission from mother to child during pregnancy, delivery, or breastfeeding was reported in 15–20% of cases."
    explanation: Supports vertical transmission as a special-context route.
progression:
- phase: Non-specific febrile illness
  notes: Early human brucellosis often resembles other febrile illnesses, complicating timely diagnosis.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012030
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucellosis, a widely spread zoonotic disease, poses significant diagnostic challenges due to its non-specific symptoms and underreporting."
    explanation: Supports an early non-specific presentation that can delay recognition.
- phase: Focal complication phase
  notes: A subset develops focal complications such as endocarditis and arthritis.
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Supports progression from systemic symptoms to focal complications.
- phase: Relapse-prone treatment course
  notes: Antibiotic regimen choice affects relapse and treatment-failure risk.
  evidence:
  - reference: DOI:10.1038/s41598-024-69669-w
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucellosis is a difficult to treat infection that requires antibiotic combinations administered over several weeks for clearance of infection and relapse prevention."
    explanation: Supports relapse prevention as a key temporal treatment concern.
pathophysiology:
- name: Intracellular macrophage survival
  description: Brucella can survive inside macrophages, establishing an intracellular niche that supports persistence and immune evasion.
  cell_types:
  - preferred_term: macrophage
    term:
      id: CL:0000235
      label: macrophage
  biological_processes:
  - preferred_term: defense response to Gram-negative bacterium
    modifier: DYSREGULATED
    term:
      id: GO:0050829
      label: defense response to Gram-negative bacterium
  evidence:
  - reference: DOI:10.1371/journal.pone.0306429
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Brucella abortus (Ba) is a pathogen that survives inside macrophages."
    explanation: Supports macrophage intracellular survival as a core Brucella pathogenesis feature.
  downstream:
  - target: MHC-I surface down-modulation
    description: Intracellular infection context is linked to reduced MHC-I surface expression and impaired CD8+ T-cell surveillance.
    evidence:
    - reference: DOI:10.1371/journal.pone.0306429
      supports: SUPPORT
      evidence_source: IN_VITRO
      snippet: "This pathogen can evade our immune system."
      explanation: Supports immune evasion as a downstream consequence of Brucella host-cell infection.
- name: MHC-I surface down-modulation
  description: Brucella abortus RNA reduces IFN-gamma-induced surface MHC-I expression in epithelial, endothelial, and monocyte/macrophage contexts.
  cell_types:
  - preferred_term: bronchial epithelial cell
    term:
      id: CL:0002328
      label: bronchial epithelial cell
  - preferred_term: endothelial cell
    term:
      id: CL:0000115
      label: endothelial cell
  - preferred_term: monocyte
    term:
      id: CL:0000576
      label: monocyte
  - preferred_term: macrophage
    term:
      id: CL:0000235
      label: macrophage
  biological_processes:
  - preferred_term: antigen processing and presentation
    modifier: DECREASED
    term:
      id: GO:0019882
      label: antigen processing and presentation
  evidence:
  - reference: DOI:10.1371/journal.pone.0306429
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Here, we demonstrate that Ba RNA reduced the surface expression of MHC-I induced by IFN-γ in the human bronchial epithelium (Calu-6), the human alveolar epithelium (A-549) and the endothelial microvasculature (HMEC) cell lines."
    explanation: Supports MHC-I surface down-modulation in non-myeloid human cell models.
  - reference: DOI:10.1371/journal.pone.0306429
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "In addition, we showed that Ba RNA down-modulates the MHC-I surface expression induced by IFN-γ on human monocytes/macrophages via the pathway of the Epidermal Growth Factor Receptor (EGFR)."
    explanation: Supports MHC-I down-modulation in monocytes/macrophages and implicates EGFR pathway involvement.
  downstream:
  - target: Persistent multisystem infection
    description: Impaired MHC-I surface expression may help Brucella persist by reducing CD8+ T-cell surveillance.
    evidence:
    - reference: DOI:10.1371/journal.pone.0306429
      supports: SUPPORT
      evidence_source: IN_VITRO
      snippet: "In conclusion, this is the first study exploring a central immune evasion strategy, such as the downregulation of MHC-I surface expression, beyond monocytes and could shed light on how it persists effectively within the host, enduring unseen and escaping CD8+ T cell surveillance."
      explanation: Supports a causal link from MHC-I down-modulation to persistence and immune escape.
- name: Pro-inflammatory cytokine induction in epithelial and endothelial cells
  description: Brucella abortus RNA can increase IL-8 and IL-6 secretion in epithelial and endothelial cell models.
  cell_types:
  - preferred_term: epithelial cell
    term:
      id: CL:0000066
      label: epithelial cell
  - preferred_term: endothelial cell
    term:
      id: CL:0000115
      label: endothelial cell
  biological_processes:
  - preferred_term: regulation of cytokine production
    modifier: INCREASED
    term:
      id: GO:0001817
      label: regulation of cytokine production
  - preferred_term: inflammatory response
    modifier: INCREASED
    term:
      id: GO:0006954
      label: inflammatory response
  evidence:
  - reference: DOI:10.1371/journal.pone.0306429
    supports: SUPPORT
    evidence_source: IN_VITRO
    snippet: "Contrary to our expectations, HMEC, Calu-6 and A-549 cells treated with Ba RNA had higher IL-8 and IL-6 levels compared to untreated cells."
    explanation: Supports cytokine induction in epithelial and endothelial cell lines after Brucella RNA exposure.
  downstream:
  - target: Fever
    description: Inflammatory cytokine signaling contributes to systemic febrile illness.
    evidence:
    - reference: DOI:10.21203/rs.3.rs-4929733/v1
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
      explanation: Supports fever as a downstream clinical manifestation of systemic brucellosis.
- name: Persistent multisystem infection
  description: Brucellosis involves difficult-to-clear infection requiring prolonged combination therapy to clear infection and prevent relapse.
  biological_processes:
  - preferred_term: defense response to bacterium
    modifier: DYSREGULATED
    term:
      id: GO:0042742
      label: defense response to bacterium
  evidence:
  - reference: DOI:10.1038/s41598-024-69669-w
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucellosis is a difficult to treat infection that requires antibiotic combinations administered over several weeks for clearance of infection and relapse prevention."
    explanation: Supports persistent, relapse-prone infection as a clinical pathophysiology node.
phenotypes:
- category: Clinical
  name: Fever
  description: Fever is a common non-specific manifestation of human brucellosis.
  phenotype_term:
    preferred_term: Fever
    term:
      id: HP:0001945
      label: Fever
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Directly supports fever as a brucellosis symptom.
- category: Clinical
  name: Fatigue
  description: Fatigue is part of the non-specific systemic presentation.
  phenotype_term:
    preferred_term: Fatigue
    term:
      id: HP:0012378
      label: Fatigue
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Directly supports fatigue as a brucellosis symptom.
- category: Clinical
  name: Joint pain
  description: Joint pain is a common non-specific musculoskeletal manifestation.
  phenotype_term:
    preferred_term: Joint pain
    term:
      id: HP:0002829
      label: Arthralgia
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Directly supports joint pain as a brucellosis symptom.
- category: Clinical
  name: Endocarditis
  description: Endocarditis is a serious focal complication of brucellosis.
  phenotype_term:
    preferred_term: Endocarditis
    term:
      id: HP:0100584
      label: Endocarditis
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Supports endocarditis as a brucellosis complication.
- category: Clinical
  name: Arthritis
  description: Arthritis is a focal musculoskeletal complication of brucellosis.
  phenotype_term:
    preferred_term: Arthritis
    term:
      id: HP:0001369
      label: Arthritis
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The disease presents with non-specific symptoms like fever, fatigue, and joint pain, often leading to complications such as endocarditis and arthritis."
    explanation: Supports arthritis as a brucellosis complication.
- category: Clinical
  name: Maternal-fetal complications
  description: Brucellosis can adversely affect maternal-fetal pairs in endemic settings.
  evidence:
  - reference: DOI:10.1186/s43088-024-00569-8
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "This review reveals the alarming yet hidden toll brucellosis takes on maternal–fetal pairs and breastfeeding."
    explanation: Supports maternal-fetal and breastfeeding contexts as clinically important brucellosis manifestations.
- category: Clinical
  name: Hepatosplenomegaly
  description: Hepatosplenomegaly is documented among maternal-child brucellosis complications.
  phenotype_term:
    preferred_term: Hepatosplenomegaly
    term:
      id: HP:0001433
      label: Hepatosplenomegaly
  evidence:
  - reference: DOI:10.1186/s43088-024-00569-8
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Substantial risks of miscarriage (25%), preterm birth (20%), hepatosplenomegaly (10%), febrile illness (30%), and possible long-term complications were documented."
    explanation: Supports hepatosplenomegaly as a documented complication in maternal-child brucellosis literature.
environmental:
- name: Livestock-dependent setting
  presence: risk factor
  description: Livestock-dependent regions have higher exposure opportunity for zoonotic Brucella transmission.
  evidence:
  - reference: DOI:10.21203/rs.3.rs-4929733/v1
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Human brucellosis caused by various Brucella species is a significant global health concern, particularly in livestock-dependent regions."
    explanation: Supports livestock dependence as an epidemiologic exposure context.
- name: Maternal livestock exposure
  presence: risk factor
  description: Livestock exposure is a documented acquisition route among vulnerable maternal groups.
  evidence:
  - reference: DOI:10.1186/s43088-024-00569-8
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Key findings demonstrate that zoonotic brucellosis acquisition from livestock exposures among vulnerable maternal groups accounts for up to 70% of cases."
    explanation: Supports livestock exposure as a maternal risk context.
- name: Inadequate One Health control infrastructure
  presence: risk factor
  description: Weak surveillance, diagnostic, veterinary, and public-health infrastructure can impair brucellosis control in endemic settings.
  evidence:
  - reference: DOI:10.3390/microorganisms11082070
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Brucellosis One Health actors include Public Health and Veterinary Services, microbiologists, medical and veterinary practitioners and breeders."
    explanation: Supports multidisciplinary One Health control context.
  - reference: DOI:10.3390/microorganisms11082070
    supports: SUPPORT
    evidence_source: OTHER
    snippet: "Extended infrastructural weaknesses, often accentuated by geography and climate, are critically important."
    explanation: Supports infrastructure as a risk modifier for brucellosis control.
treatments:
- name: Doxycycline-rifampicin combination therapy
  description: Standard oral dual antibiotic therapy used for uncomplicated human brucellosis and bacteremic disease, though relapse risk can be higher than with some aminoglycoside-containing regimens.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
    therapeutic_agent:
    - preferred_term: doxycycline
      term:
        id: CHEBI:50845
        label: doxycycline
    - preferred_term: rifampicin
      term:
        id: CHEBI:28077
        label: rifampicin
  target_mechanisms:
  - target: Persistent multisystem infection
    treatment_effect: INHIBITS
    description: Combination antibiotic therapy targets clearance of persistent infection and prevention of relapse.
    evidence:
    - reference: DOI:10.1038/s41598-024-69669-w
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Brucellosis is a difficult to treat infection that requires antibiotic combinations administered over several weeks for clearance of infection and relapse prevention."
      explanation: Supports using prolonged combination therapy to clear infection and reduce relapse.
  evidence:
  - reference: DOI:10.1038/s41598-024-69669-w
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "However, the latter is also efficacious and suitable for uncomplicated disease."
    explanation: In context, supports doxycycline-rifampicin as an efficacious uncomplicated-disease option despite better outcomes for some triple therapies.
  - reference: DOI:10.37723/jumdc.v15i3.920
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "CONCLUSION: Oral doxycycline-rifampicin (DR) and IV gentamicin-doxycycline-rifampicin (GDR) regimens have similar response rates in bacteremia brucellosis."
    explanation: Supports oral doxycycline-rifampicin as a bacteremic brucellosis regimen in an observational comparison.
- name: Doxycycline-streptomycin combination therapy
  description: Aminoglycoside-containing combination therapy with evidence of superior efficacy compared with doxycycline-rifampicin in network meta-analyses.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
    therapeutic_agent:
    - preferred_term: doxycycline
      term:
        id: CHEBI:50845
        label: doxycycline
    - preferred_term: streptomycin
      term:
        id: CHEBI:17076
        label: streptomycin
  target_mechanisms:
  - target: Persistent multisystem infection
    treatment_effect: INHIBITS
    description: Aminoglycoside-containing doxycycline therapy is used to improve clearance and reduce relapse risk.
    evidence:
    - reference: DOI:10.1371/journal.pntd.0012010
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "This review confirmed the superiority of drugs already indicated for treating human brucellosis, such as the combination of doxycycline and aminoglycosides."
      explanation: Supports an aminoglycoside-containing doxycycline regimen as a superior brucellosis treatment strategy.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012405
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Brucellosis medications differ in efficacy and safety. Doxycycline + Gentamicin, Triple, and Doxycycline + Streptomycin have superior efficacy and safety."
    explanation: Supports doxycycline-streptomycin as a high-performing regimen class.
  - reference: DOI:10.1038/s41598-024-69669-w
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Triple antibiotic therapy is more effective than standard dual therapy with rifampicin and doxycycline."
    explanation: Supports intensifying beyond standard dual therapy for improved treatment outcomes.
- name: Doxycycline-gentamicin combination therapy
  description: Aminoglycoside-containing combination therapy ranked highest for efficacy in a 2024 network meta-analysis of randomized trials.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
    therapeutic_agent:
    - preferred_term: doxycycline
      term:
        id: CHEBI:50845
        label: doxycycline
    - preferred_term: gentamicin
      term:
        id: CHEBI:17833
        label: gentamycin
  target_mechanisms:
  - target: Persistent multisystem infection
    treatment_effect: INHIBITS
    description: Doxycycline-gentamicin therapy is used to improve infection clearance and prevent treatment failure.
    evidence:
    - reference: DOI:10.1371/journal.pntd.0012405
      supports: SUPPORT
      evidence_source: HUMAN_CLINICAL
      snippet: "Doxycycline + Gentamicin ranked the best in efficacy (SUCRA values: 0.94), the second is Triple (SUCRA values: 0.87), and the third is Doxycycline + Streptomycin (SUCRA values: 0.78)."
      explanation: Supports doxycycline-gentamicin as the top-ranked efficacy regimen in the network meta-analysis.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012405
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Doxycycline + Gentamicin ranked the best in efficacy (SUCRA values: 0.94), the second is Triple (SUCRA values: 0.87), and the third is Doxycycline + Streptomycin (SUCRA values: 0.78)."
    explanation: Supports doxycycline-gentamicin as a high-efficacy brucellosis regimen.
- name: Doxycycline-streptomycin-hydroxychloroquine triple therapy
  description: Emerging triple therapy identified as a potential strategy to reduce overall therapy failure, with very low-certainty evidence requiring confirmation.
  treatment_term:
    preferred_term: pharmacotherapy
    term:
      id: MAXO:0000058
      label: pharmacotherapy
    therapeutic_agent:
    - preferred_term: doxycycline
      term:
        id: CHEBI:50845
        label: doxycycline
    - preferred_term: streptomycin
      term:
        id: CHEBI:17076
        label: streptomycin
    - preferred_term: hydroxychloroquine
      term:
        id: CHEBI:5801
        label: hydroxychloroquine
  target_mechanisms:
  - target: Persistent multisystem infection
    treatment_effect: INHIBITS
    description: Hydroxychloroquine-containing triple therapy may reduce treatment failure, but evidence remains low certainty and investigational.
    evidence:
    - reference: DOI:10.1371/journal.pntd.0012010
      supports: PARTIAL
      evidence_source: HUMAN_CLINICAL
      snippet: "The association of hydroxychloroquine to the dual regimen was identified as a potential strategy to prevent overall therapy failure, which is subject to confirmation in future studies."
      explanation: Supports the regimen as a promising but not yet definitive treatment strategy.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012010
    supports: PARTIAL
    evidence_source: HUMAN_CLINICAL
    snippet: "The association of hydroxychloroquine to the dual regimen was identified as a potential strategy to prevent overall therapy failure, which is subject to confirmation in future studies."
    explanation: Conservatively supports hydroxychloroquine triple therapy as emerging/partial evidence pending confirmation.
diagnosis:
- name: Culture and serology reference standards
  description: Human brucellosis diagnostic studies commonly compare index tests against culture and/or standard tube agglutination testing.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012030
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Regarding the reference test, culture and/or SAT are deemed more appropriate than culture alone."
    explanation: Supports culture and SAT as important reference standards.
- name: Rose Bengal, ELISA, and PCR testing
  description: Rose Bengal, IgG/IgM ELISA, and PCR are promising tools for confirming suspected human brucellosis when interpreted in context.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012030
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "Rose Bengal, IgG/IgM ELISA, and PCR exhibited equally high performances, indicating superior overall diagnostic accuracy, with very low certainty of the evidence."
    explanation: Supports these diagnostic modalities and preserves the evidence-certainty caveat.
- name: Combined serologic diagnostic algorithm
  description: Combining RBT with Brucellacapt and ELISA IgM/IgG improved diagnostic performance in a French reference-center study.
  evidence:
  - reference: DOI:10.1371/journal.pntd.0012442
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: "The most promising results were observed when an algorithm was built combining RBT, Brucellacapt, and ELISA for IgM and IgG (a score value of 0.5 with 90.5% for sensitivity, 99.7% for specificity, 92.4% for PPV, and 99.6% for NPV)."
    explanation: Supports combined serology algorithms as a diagnostic performance improvement strategy.
clinical_trials: []
datasets:
📚

References & Deep Research

Deep Research

1
Falcon ▸
Disease Characteristics Research Template
Edison Scientific Literature 55 citations 2026-05-08T09:35:56.858177

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on: 1. Key concepts and definitions with current understanding 2. Recent developments and latest research (prioritize 2023-2024 sources) 3. Current applications and real-world implementations 4. Expert opinions and analysis from authoritative sources 5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available. Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Disease Characteristics Research Template

Target Disease

  • Disease Name: Brucellosis
  • MONDO ID: (if available)
  • Category: Infectious

Research Objectives

Please provide a comprehensive research report on Brucellosis covering all of the disease characteristics listed below. This report will be used to populate a disease knowledge base entry. Be thorough and cite primary literature (PMID preferred) for all claims.

For each section, suggested databases/resources are listed. These are the first places you should search for information on each topic.

1. Disease Information

Search first: OMIM, Orphanet, ICD-10/ICD-11, MeSH, PubMed

  • What is the disease? Provide a concise overview.
  • What are the key identifiers? (OMIM, Orphanet, ICD-10/ICD-11, MeSH, Mondo)
  • What are the common synonyms and alternative names?
  • Is the information derived from individual patients (e.g., EHR) or aggregated disease-level resources?

2. Etiology

  • Disease Causal Factors: What are the primary causes? (genetic, environmental, infectious, mechanistic)
  • Risk Factors:

    Search first: PubMed, Cochrane Library, UpToDate, clinical guidelines, ClinVar, ClinGen, GWAS Catalog, PheGenI, CTD, CDC, WHO, epidemiological databases

  • Genetic risk factors (causal variants, susceptibility loci, modifier genes)
  • Environmental risk factors (toxins, lifestyle, occupational exposures, age, sex, family history)
  • Protective Factors:

    Search first: PubMed, Cochrane Library, clinical trial databases, GWAS Catalog, gnomAD, WHO, CDC, nutrition databases

  • Genetic protective factors (protective variants, modifier alleles)
  • Environmental protective factors (diet, lifestyle, exposures that reduce risk)
  • Gene-Environment Interactions: How do genetic and environmental factors interact to influence disease?

    Search first: CTD, PubMed, PheGenI, GxE databases

3. Phenotypes

Search first: HPO (Human Phenotype Ontology), OMIM, Orphanet, PubMed, clinicaltrials.gov, MedDRA, SNOMED CT, DECIPHER, LOINC

For each phenotype, provide: - Phenotype type: symptoms, clinical signs, physical manifestations, behavioral changes, or laboratory abnormalities

For symptoms/signs: HPO, OMIM, Orphanet, PubMed For behavioral changes: HPO, DSM, RDoC (Research Domain Criteria), PubMed For laboratory abnormalities: LOINC, SNOMED CT, LabTests Online, PubMed - Phenotype characteristics: Search first: OMIM, Orphanet, HPO, PubMed - Age of symptom onset (neonatal, childhood, adult-onset, late-onset) - Symptom severity (mild, moderate, severe, variable) - Symptom progression (stable, progressive, episodic, fluctuating) - Frequency among affected individuals (percentage or qualitative) - Quality of life impact: Effects on daily functioning and well-being (per-phenotype when possible) Search first: EQ-5D database, SF-36, WHO QOL databases, PubMed - Suggest HPO (Human Phenotype Ontology) terms for each phenotype

4. Genetic/Molecular Information

  • Causal Genes: Gene mutations or chromosomal abnormalities responsible for disease (gene symbols, OMIM IDs)

    Search first: OMIM, ClinVar, HGMD, Ensembl, NCBI Gene

  • Pathogenic Variants:
  • Affected genes (gene symbols, HGNC IDs) > Search first: OMIM, NCBI Gene, Ensembl, HGNC, UniProt, GeneCards
  • Variant classification (pathogenic, likely pathogenic, VUS per ACMG/AMP guidelines) > Search first: ClinVar, ClinGen, ACMG/AMP guidelines, VarSome
  • Variant type/class (missense, frameshift, nonsense, splice-site, structural)
  • Allele frequency in population databases > Search first: gnomAD, 1000 Genomes, ExAC, TOPMed, dbSNP
  • Somatic vs germline origin > Search first: COSMIC (somatic), ClinVar, ICGC, TCGA
  • Functional consequences (loss of function, gain of function, dominant negative)
  • Modifier Genes: Genes that modify disease severity or expression
  • Epigenetic Information: DNA methylation, histone modifications, chromatin changes affecting disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Chromosomal Abnormalities: Large-scale genetic changes (aneuploidy, translocations, inversions)

    Search first: DECIPHER, ClinVar, ECARUCA, UCSC Genome Browser

5. Environmental Information

  • Environmental Factors: Non-genetic contributing factors (toxins, radiation, pollution, occupational exposure)

    Search first: CTD (Comparative Toxicogenomics Database), TOXNET, PubMed, EPA databases

  • Lifestyle Factors: Behavioral factors (smoking, diet, exercise, alcohol consumption)

    Search first: CDC databases, WHO, PubMed, NHANES

  • Infectious Agents: If applicable, pathogens causing or triggering disease (bacteria, viruses, fungi, parasites)

    Search first: NCBI Taxonomy, ViPR, BV-BRC, MicrobeDB, GIDEON

6. Mechanism / Pathophysiology

  • Molecular Pathways: Specific signaling cascades or biochemical pathways involved (Wnt, MAPK, mTOR, PI3K-AKT, etc.)

    Search first: KEGG, Reactome, WikiPathways, PathBank, BioCyc

  • Cellular Processes: Cell-level mechanisms (apoptosis, autophagy, cell cycle dysregulation, inflammation, etc.)

    Search first: Gene Ontology (GO), Reactome, KEGG, PubMed

  • Protein Dysfunction: How protein structure or function is altered (misfolding, aggregation, loss of function, gain of function)

    Search first: UniProt, PDB (Protein Data Bank), InterPro, Pfam, AlphaFold

  • Metabolic Changes: Alterations in metabolic processes (energy metabolism, lipid metabolism, amino acid metabolism)

    Search first: KEGG, BioCyc, HMDB (Human Metabolome Database), BRENDA

  • Immune System Involvement: Role of immune response (autoimmunity, immunodeficiency, chronic inflammation)

    Search first: ImmPort, Immunome Database, IEDB, Gene Ontology

  • Tissue Damage Mechanisms: How tissues/ are injured (oxidative stress, ischemia, fibrosis, necrosis)

    Search first: PubMed, Gene Ontology, Reactome

  • Biochemical Abnormalities: Specific molecular defects (enzyme deficiencies, receptor dysfunction, ion channel defects)

    Search first: BRENDA, UniProt, KEGG, OMIM, PubMed

  • Epigenetic Changes: DNA methylation, histone modifications affecting gene expression in disease

    Search first: ENCODE, Roadmap Epigenomics, MethBase, DiseaseMeth

  • Molecular Profiling (if available):
  • Transcriptomics/gene expression changes > Search first: GEO (Gene Expression Omnibus), ArrayExpress, GTEx, Human Cell Atlas, SRA
  • Proteomics findings > Search first: PRIDE, ProteomeXchange, Human Protein Atlas, STRING, BioGRID
  • Metabolomics signatures > Search first: MetaboLights, Metabolomics Workbench, HMDB, METLIN
  • Lipidomics alterations > Search first: LIPID MAPS, SwissLipids, LipidHome, Metabolomics Workbench
  • Genomic structural features > Search first: UCSC Genome Browser, Ensembl, NCBI, dbVar, DGV
  • Advanced Technologies (if applicable):
  • Single-cell analysis findings (cell-type specific mechanisms, cellular heterogeneity) > Search first: Human Cell Atlas, Single Cell Portal, GEO, CELLxGENE
  • Spatial transcriptomics findings > Search first: GEO, Spatial Research, Vizgen, 10x Genomics data
  • Multi-omics integration results > Search first: TCGA, ICGC, cBioPortal, LinkedOmics, PubMed
  • Functional genomics screens (CRISPR, RNAi) > Search first: DepMap, GenomeRNAi, PubMed, BioGRID ORCS

For each mechanism, describe: - The causal chain from initial trigger to clinical manifestation - Which mechanisms are upstream vs downstream - What cell types and biological processes are involved - Suggest GO terms for biological processes and CL terms for cell types

7. Anatomical Structures Affected

  • Organ Level:
  • Primary organs directly affected
  • Secondary organ involvement (complications, secondary effects)
  • Body systems involved (cardiovascular, nervous, digestive, respiratory, endocrine, etc.)

    Search first: Uberon, FMA (Foundational Model of Anatomy), OMIM, HPO, ICD-11, MeSH, SNOMED CT

  • Tissue and Cell Level:
  • Specific tissue types affected (epithelial, connective, muscle, nervous)
  • Specific cell populations targeted (with Cell Ontology terms)

    Search first: Uberon, Human Protein Atlas, Cell Ontology, Human Cell Atlas, CellMarker, PanglaoDB

  • Subcellular Level:
  • Cellular compartments involved (mitochondria, nucleus, ER, lysosomes) (with GO Cellular Component terms)

    Search first: Gene Ontology (Cellular Component), UniProt, Human Protein Atlas

  • Localization:
  • Specific anatomical sites (with UBERON terms) > Search first: FMA, Uberon, NeuroNames (for brain), SNOMED CT
  • Lateralization (unilateral, bilateral, asymmetric) > Search first: HPO, clinical literature, imaging databases

8. Temporal Development

  • Onset:
  • Typical age of onset (congenital, pediatric, adult, geriatric)
  • Onset pattern (acute, subacute, chronic, insidious)

    Search first: OMIM, Orphanet, HPO, PubMed

  • Progression:
  • Disease stages (early, intermediate, advanced, end-stage) > Search first: Cancer Staging Manual (AJCC), WHO classifications, PubMed
  • Progression rate (rapid, slow, variable)
  • Disease course pattern (episodic, relapsing-remitting, progressive, stable)
  • Disease duration (self-limited, chronic lifelong)

    Search first: Disease registries, longitudinal cohort databases, natural history studies, PubMed, Orphanet, OMIM

  • Patterns:
  • Remission patterns (spontaneous, treatment-induced) > Search first: Clinical trial databases, disease registries, PubMed
  • Critical periods (time windows of vulnerability or opportunity for intervention) > Search first: PubMed, developmental biology databases, clinical guidelines

9. Inheritance and Population

  • Epidemiology:
  • Prevalence (cases per 100,000 at given time)
  • Incidence (new cases per 100,000 per year)

    Search first: Orphanet, CDC, WHO, GBD (Global Burden of Disease), national registries, SEER, disease registries

  • For Genetic Etiology:
  • Inheritance pattern (AD, AR, X-linked, mitochondrial, multifactorial, polygenic) > Search first: OMIM, Orphanet, ClinVar, GTR (Genetic Testing Registry)
  • Penetrance (complete, incomplete, age-dependent) > Search first: ClinVar, OMIM, PubMed, ClinGen
  • Expressivity (variable, consistent) > Search first: OMIM, ClinVar, PubMed
  • Genetic anticipation (increasing severity in successive generations) > Search first: OMIM, PubMed (especially for repeat expansion disorders)
  • Germline mosaicism > Search first: ClinVar, OMIM, genetic counseling literature, PubMed
  • Founder effects (population-specific mutations) > Search first: gnomAD, population genetics databases, PubMed
  • Consanguinity role > Search first: OMIM, population studies, genetic counseling resources
  • Carrier frequency > Search first: gnomAD, carrier screening databases, GeneReviews, GTR
  • Population Demographics:
  • Affected populations (ethnic or demographic groups with higher prevalence) > Search first: gnomAD, 1000 Genomes, PAGE Study, PubMed, population registries
  • Geographic distribution (endemic areas, regional variation) > Search first: WHO, CDC, GBD, Orphanet, geographic epidemiology databases
  • Geographic distribution of specific variants
  • Sex ratio (male:female) > Search first: Disease registries, OMIM, PubMed, epidemiological databases
  • Age distribution of affected individuals > Search first: CDC, disease registries, SEER, Orphanet

10. Diagnostics

  • Clinical Tests:
  • Laboratory tests (blood, urine, tissue chemistry, specific enzyme assays) > Search first: LOINC, LabTests Online, PubMed
  • Biomarkers (proteins, metabolites, genetic markers, circulating biomarkers) > Search first: FDA Biomarker List, BEST (Biomarkers, EndpointS, and other Tools), PubMed
  • Imaging studies (X-ray, CT, MRI, PET, ultrasound) > Search first: RadLex, DICOM, Radiopaedia, imaging databases
  • Functional tests (pulmonary function, cardiac stress tests) > Search first: LOINC, clinical guidelines, PubMed
  • Electrophysiology (EEG, EMG, ECG, nerve conduction studies) > Search first: LOINC, clinical neurophysiology databases, PubMed
  • Biopsy findings (histopathology, immunohistochemistry) > Search first: SNOMED CT, College of American Pathologists resources, PubMed
  • Pathology findings (microscopic examination) > Search first: SNOMED CT, Digital Pathology databases, PubMed
  • Genetic Testing:

    Search first: GTR (Genetic Testing Registry), GeneReviews, ClinGen

  • Overview of recommended genetic testing approach
  • Whole genome sequencing (WGS) utility > Search first: GTR, ClinVar, GEL (Genomics England), gnomAD
  • Whole exome sequencing (WES) utility > Search first: GTR, ClinVar, OMIM, GeneMatcher
  • Gene panels (which panels, which genes) > Search first: GTR, ClinVar, laboratory-specific databases
  • Single gene testing > Search first: GTR, ClinVar, OMIM, GeneReviews
  • Chromosomal microarray (CMA) > Search first: DECIPHER, ClinVar, dbVar, ECARUCA
  • Karyotyping > Search first: Chromosome Abnormality Database, ClinVar, cytogenetics resources
  • FISH > Search first: ClinVar, cytogenetics databases, PubMed
  • Mitochondrial DNA testing > Search first: MITOMAP, MSeqDR, ClinVar, GTR
  • Repeat expansion testing > Search first: GTR, ClinVar, repeat expansion databases, PubMed
  • Omics-Based Diagnostics (if applicable):
  • RNA sequencing / transcriptomics > Search first: GEO, ArrayExpress, GTEx, RNA-seq databases
  • Proteomics > Search first: PRIDE, ProteomeXchange, FDA Biomarker database
  • Metabolomics > Search first: MetaboLights, Metabolomics Workbench, HMDB
  • Epigenomics > Search first: GEO, ENCODE, Roadmap Epigenomics, MethBase
  • Liquid biopsy > Search first: COSMIC, ClinVar, liquid biopsy databases, PubMed
  • Clinical Criteria:
  • Standardized diagnostic criteria (DSM, ICD, society guidelines) > Search first: DSM-5, ICD-11, clinical society guidelines, UpToDate
  • Differential diagnosis (other conditions to rule out, with distinguishing features) > Search first: DynaMed, UpToDate, clinical decision support systems
  • Screening:
  • Screening methods for asymptomatic individuals (newborn screening, carrier screening, cascade screening) > Search first: ACMG recommendations, CDC newborn screening, GTR

11. Outcome/Prognosis

  • Survival and Mortality:
  • Survival rate (5-year, 10-year, overall) > Search first: SEER, cancer registries, disease-specific registries, PubMed
  • Life expectancy (with and without treatment if applicable) > Search first: Orphanet, disease registries, actuarial databases, PubMed
  • Mortality rate > Search first: CDC, WHO, GBD, national mortality databases
  • Disease-specific mortality (deaths directly attributable to disease) > Search first: Disease registries, CDC Wonder, GBD, PubMed
  • Morbidity and Function:
  • Morbidity (disease-related disability and health impacts) > Search first: GBD, WHO, disability databases, PubMed
  • Disability outcomes (long-term functional impairments) > Search first: ICF (International Classification of Functioning), disability registries
  • Quality of life measures (EQ-5D, SF-36, PROMIS, disease-specific tools) > Search first: EQ-5D database, SF-36, PROMIS, PubMed
  • Disease Course:
  • Complications (secondary problems: infections, organ failure, etc.) > Search first: ICD codes, disease registries, clinical databases, PubMed
  • Recovery potential (likelihood and extent of recovery, with vs without treatment) > Search first: Natural history studies, rehabilitation databases, PubMed
  • Prediction:
  • Prognostic factors (age, disease severity, biomarkers, treatment response) > Search first: Prognostic models databases, clinical calculators, PubMed
  • Prognostic biomarkers (molecular markers predicting disease course) > Search first: FDA Biomarker database, PubMed, cancer prognostic databases

12. Treatment

  • Pharmacotherapy:
  • Pharmacological treatments (drug names, drug classes, mechanisms of action) > Search first: DrugBank, RxNorm, ATC classification, DailyMed, FDA databases
  • Pharmacogenomics (how genetic variants affect drug metabolism, efficacy, toxicity) > Search first: PharmGKB, CPIC (Clinical Pharmacogenetics), FDA Table of PGx Biomarkers
  • Advanced Therapeutics:
  • Gene therapy (viral vectors, CRISPR, gene replacement, gene editing) > Search first: ClinicalTrials.gov, FDA gene therapy database, ASGCT resources
  • Cell therapy (stem cell transplant, CAR-T, cellular therapeutics) > Search first: ClinicalTrials.gov, FDA cell therapy database, FACT standards
  • RNA-based therapies (ASOs, siRNA, mRNA therapies) > Search first: ClinicalTrials.gov, FDA approvals, PubMed
  • Targeted therapies (treatments directed at specific molecular targets) > Search first: My Cancer Genome, OncoKB, ClinicalTrials.gov, FDA approvals
  • Immunotherapies (checkpoint inhibitors, monoclonal antibodies) > Search first: Cancer Immunotherapy Database, FDA approvals, ClinicalTrials.gov
  • Surgical and Interventional:
  • Surgical interventions (types of surgery, timing, outcomes) > Search first: CPT codes, surgical registries, clinical guidelines, PubMed
  • Supportive and Rehabilitative:
  • Supportive care (symptom management, pain control, nutrition) > Search first: Clinical guidelines, Cochrane Library, PubMed
  • Rehabilitation (physical therapy, occupational therapy, speech therapy) > Search first: Rehabilitation medicine databases, clinical guidelines, PubMed
  • Experimental:
  • Experimental treatments in clinical trials (with NCT identifiers if available) > Search first: ClinicalTrials.gov, EU Clinical Trials Register, WHO ICTRP
  • Treatment Outcomes:
  • Treatment response rates > Search first: Clinical trial databases, FDA reviews, systematic reviews, PubMed
  • Side effects and adverse events > Search first: FDA Adverse Event Reporting System (FAERS), MedWatch, PubMed
  • Treatment Strategy:
  • Treatment algorithms (clinical pathways, decision trees) > Search first: Clinical practice guidelines, NCCN Guidelines, UpToDate
  • Combination therapies > Search first: ClinicalTrials.gov, treatment guidelines, PubMed
  • Personalized medicine approaches (genotype-guided treatment) > Search first: My Cancer Genome, CIViC, PharmGKB, precision medicine databases

For each treatment, suggest MAXO (Medical Action Ontology) terms where applicable.

13. Prevention

  • Prevention Levels:
  • Primary prevention (preventing disease occurrence: vaccination, risk factor modification) > Search first: CDC, WHO, USPSTF recommendations, Cochrane Library
  • Secondary prevention (early detection and treatment: screening programs, early intervention) > Search first: USPSTF, CDC screening guidelines, WHO
  • Tertiary prevention (preventing complications in those with disease) > Search first: Clinical guidelines, disease management protocols, PubMed
  • Immunization: Vaccine strategies (if applicable)

    Search first: CDC vaccine schedules, WHO immunization, FDA vaccine database

  • Screening and Early Detection:
  • Screening programs (population-based: newborn screening, cancer screening) > Search first: CDC screening programs, USPSTF, cancer screening databases
  • Genetic screening (carrier screening, preimplantation genetic diagnosis, prenatal testing) > Search first: ACMG recommendations, ACOG guidelines, GTR
  • Risk stratification (identifying high-risk individuals for targeted prevention) > Search first: Risk prediction models, clinical calculators, PubMed
  • Behavioral Interventions: Lifestyle modifications to reduce risk

    Search first: CDC, WHO, behavioral intervention databases, Cochrane Library

  • Counseling: Genetic counseling (risk assessment, family planning guidance)

    Search first: NSGC resources, ACMG guidelines, GeneReviews

  • Public Health:
  • Public health interventions (sanitation, vector control, health education) > Search first: CDC, WHO, public health databases, PubMed
  • Environmental interventions (reducing environmental risk factors) > Search first: EPA databases, WHO environmental health, PubMed
  • Prophylaxis: Preventive medications or procedures

    Search first: Clinical guidelines, FDA approvals, PubMed

14. Other Species / Natural Disease

  • Taxonomy: Species affected (with NCBI Taxon identifiers)

    Search first: NCBI Taxonomy

  • Breed: Specific breeds affected (with VBO identifiers if applicable)

    Search first: VBO (Vertebrate Breed Ontology)

  • Gene: Orthologous genes in other species (with NCBI Gene IDs)

    Search first: NCBI Gene

  • Natural Disease:
  • Naturally occurring disease in other species (companion animals, wildlife) > Search first: OMIA (Online Mendelian Inheritance in Animals), VetCompass, PubMed
  • Veterinary relevance and importance in animal health > Search first: OMIA, veterinary databases, PubMed
  • Comparative Biology:
  • Comparative pathology (similarities and differences across species) > Search first: OMIA, comparative pathology databases, PubMed
  • Evolutionary conservation of disease mechanisms > Search first: HomoloGene, OrthoMCL, Alliance of Genome Resources
  • Transmission (if applicable):
  • Zoonotic potential > Search first: CDC zoonotic diseases, WHO zoonoses, GIDEON
  • Cross-species susceptibility > Search first: NCBI Taxonomy, veterinary databases, PubMed

15. Model Organisms

  • Model Types:
  • Model organism type (mammalian, invertebrate, cellular, in vitro) > Search first: Alliance of Genome Resources, model organism databases
  • Specific model systems (mouse, rat, zebrafish, Drosophila, C. elegans, yeast, cell lines, organoids, iPSCs) > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, SGD, ATCC, Cellosaurus
  • Induced models (drug treatment, surgical intervention, environmental manipulation) > Search first: MGI, model organism databases, PubMed
  • Genetic Models:
  • Types available (knockout, knock-in, transgenic, conditional, humanized) > Search first: MGI, IMPC, KOMP, EuMMCR, IMSR
  • Model Characteristics:
  • Phenotype recapitulation (how well model reproduces human disease features) > Search first: Model organism databases, comparative studies, PubMed
  • Model limitations (aspects of human disease not captured) > Search first: Model organism databases, PubMed, review articles
  • Applications:
  • Research applications (what aspects of disease can be studied) > Search first: Model organism databases, PubMed
  • Resources:
  • Model databases > Search first: MGI, RGD, ZFIN, FlyBase, WormBase, IMSR, EMMA, MMRRC

Citation Requirements

  • Cite primary literature (PMID preferred) for all mechanistic and clinical claims
  • Prioritize recent reviews and landmark papers
  • Include direct quotes from abstracts where possible to support key statements
  • Distinguish evidence source types: human clinical, model organism, in vitro, computational

Output Format

Structure your response as a comprehensive narrative organized by the sections above. For each section, provide: - Factual content with specific details (numbers, percentages, gene names, variant nomenclature) - Ontology term suggestions (HPO, GO, CL, UBERON, CHEBI, MAXO, MONDO) where applicable - Evidence citations with PMIDs - Direct quotes from abstracts to support key claims - Clear indication when information is not available or not applicable for this disease

This report will be used to populate a disease knowledge base entry with: - Pathophysiology descriptions with causal chains - Gene/protein annotations (HGNC, GO terms) - Phenotype associations (HP terms) with frequencies - Cell type involvement (CL terms) - Anatomical locations (UBERON terms) - Chemical entities (CHEBI terms) - Treatment annotations (MAXO terms) - Evidence items with PMIDs and exact abstract quotes - Epidemiology, prognosis, diagnostic, and prevention information - Animal model descriptions with phenotype recapitulation details

Brucellosis (Disease Characteristics Research Report)

Target disease

  • Disease name: Brucellosis (human brucellosis)
  • Category: Infectious; zoonotic bacterial disease
  • MONDO ID: Not retrievable from the currently available, citable full-text corpus in this run (reported as unavailable rather than inferred) (ayoubi2024themanyfaces pages 1-2).

Executive summary (current understanding; 2023–2024 priority)

Brucellosis is a multisystem zoonotic infection caused by Brucella spp. and remains widely endemic and underdiagnosed, with modern global modeling estimating ~2.1 million human cases/year—substantially higher than historically assumed (Laine et al., Sep 2023, Emerging Infectious Diseases, https://doi.org/10.3201/eid2909.230052) (laine2023globalestimateof pages 1-2). Transmission is primarily foodborne (unpasteurized dairy) and occupational (animal contact), but documented additional routes include inhalation of aerosols and vertical transmission in special contexts (ayoubi2024themanyfaces pages 1-2, moriyon2023brucellosisandone pages 1-2, huy2024exploringtheimpact pages 1-2). Diagnostic progress in 2023–2024 emphasizes combining serologic tests and newer immunoassay approaches; pooled evidence suggests Rose Bengal, ELISA, and PCR can all perform well, but certainty of evidence is often low and algorithms outperform single tests in practice (Freire et al., Mar 2024, https://doi.org/10.1371/journal.pntd.0012030; Loubet et al., Sep 2024, https://doi.org/10.1371/journal.pntd.0012442) (freire2024diagnosisofhuman pages 9-11, loubet2024diagnosisofbrucellosis pages 1-2). Treatment evidence in 2024 network meta-analyses supports aminoglycoside-containing doxycycline regimens and some triple-therapy strategies as more effective than doxycycline–rifampicin for overall failure/relapse endpoints, though evidence certainty varies (Silva et al., Mar 2024, https://doi.org/10.1371/journal.pntd.0012010; Huang et al., Aug 2024, https://doi.org/10.1371/journal.pntd.0012405; Maduranga et al., Aug 2024, https://doi.org/10.1038/s41598-024-69669-w) (silva2024efficacyandsafety pages 18-21, huang2024updatedtherapeuticoptions pages 1-2, maduranga2024asystematicreview pages 3-6).

A compact table of key quantitative statistics is provided here:

Domain Key finding (with numbers) Population/setting Study type Publication (first author year journal) Publication date/month URL Citations
Global burden/incidence Conservative global annual incidence estimate: 2.1 million cases/year; highest burden in Africa and Asia Global Modeling study using international surveillance/public health data Laine 2023 Emerging Infectious Diseases 2023 Sep https://doi.org/10.3201/eid2909.230052 (laine2023globalestimateof pages 1-2)
Global prevalence Pooled prevalence 15.49% (95% CI 12.01–18.97); Asia 16.65%, Africa 16.28%, Americas 11.09%; male 19.11% vs female 13.97% 69 studies worldwide Systematic review and meta-analysis Sherasiya 2024 preprint 2024 Sep https://doi.org/10.21203/rs.3.rs-4929733/v1 (sherasiya2024globalprevalenceof pages 1-4, sherasiya2024globalprevalenceof pages 7-10)
National epidemiology 2,489 culture-confirmed cases (2004–2022); 99.8% bacteraemic; 64% male; mean age 30.5 y; B. melitensis 99.6%; annual incidence 1.6/100,000 overall, 6.6/100,000 Arab, 5.5/100,000 Druze, 0.18/100,000 Jewish; Arab South District peak 41.0/100,000 in 2012 Israel national surveillance, 2004–2022 National retrospective epidemiology study Weinberger 2024 Epidemiology and Infection 2024 May https://doi.org/10.1017/S0950268824000803 (weinberger2024nationalepidemiologyof pages 2-3, weinberger2024nationalepidemiologyof pages 1-2)
Regional epidemiology Overall pooled seroprevalence 5.0% (95% CI 3.0–6.0); human 6.9% (95% CI 4.9–8.8); cattle 3.5% (95% CI 2.2–4.7); heterogeneity I² 99.61% Ethiopia, 39 studies (2015–2024) Systematic review and meta-analysis Dagnaw 2024 BMC Public Health 2024 Dec https://doi.org/10.1186/s12889-024-21042-2 (dagnaw2024humanandanimal pages 1-2)
Risk factors Major risks: raw milk/unpasteurized dairy, contact with aborted materials/fetuses, occupation (livestock owners, abattoir workers, veterinarians), direct animal contact Global/Ethiopia/Israel Mixed: modeling, meta-analysis, national epidemiology Multiple recent sources 2023–2024 https://doi.org/10.3201/eid2909.230052 (weinberger2024nationalepidemiologyof pages 1-2, laine2023globalestimateof pages 1-2, sherasiya2024globalprevalenceof pages 1-4, dagnaw2024humanandanimal pages 1-2)
Diagnostic accuracy Rose Bengal pooled sensitivity/specificity vs culture: 89.7% / 94.1%; vs culture and/or SAT: 96.6% / 97.9% Symptomatic suspected human brucellosis Systematic review and meta-analysis Freire 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012030 (freire2024diagnosisofhuman pages 9-11, freire2024diagnosisofhuman pages 1-2)
Diagnostic accuracy SAT pooled sensitivity/specificity vs culture: 89.2% / 95.6% Symptomatic suspected human brucellosis Systematic review and meta-analysis Freire 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012030 (freire2024diagnosisofhuman pages 9-11)
Diagnostic accuracy IgG ELISA pooled sensitivity/specificity vs culture: 82.9% / 96.2%; specificity vs culture and/or SAT reached 99.0% Symptomatic suspected human brucellosis Systematic review and meta-analysis Freire 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012030 (freire2024diagnosisofhuman pages 9-11)
Diagnostic accuracy IgM ELISA pooled sensitivity/specificity vs culture: 84.5% / 95.3% Symptomatic suspected human brucellosis Systematic review and meta-analysis Freire 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012030 (freire2024diagnosisofhuman pages 9-11)
Diagnostic accuracy Qualitative PCR pooled sensitivity/specificity vs culture: 96.4% / 98.1%; real-time PCR: 81.9% / 91.5% Symptomatic suspected human brucellosis Systematic review and meta-analysis Freire 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012030 (freire2024diagnosisofhuman pages 9-11)
Diagnostic algorithm Combined RBT + Brucellacapt + ELISA IgM/IgG achieved 90.5% sensitivity, 99.7% specificity, 92.4% PPV, 99.6% NPV French National Reference Center, 3,587 sera; 148 confirmed cases Retrospective diagnostic accuracy study Loubet 2024 PLOS Neglected Tropical Diseases 2024 Sep https://doi.org/10.1371/journal.pntd.0012442 (loubet2024diagnosisofbrucellosis pages 1-2)
Treatment comparative efficacy Standard doxycycline + rifampicin had higher failure risk than triple therapy adding streptomycin: RR 1.98 (95% CI 1.17–3.35); and adding levofloxacin: RR 2.98 (95% CI 1.67–5.32) Human brucellosis, 34 studies, 4,182 participants Systematic review and meta-analysis Maduranga 2024 Scientific Reports 2024 Aug https://doi.org/10.1038/s41598-024-69669-w (maduranga2024asystematicreview pages 3-6, maduranga2024asystematicreview pages 1-2)
Treatment comparative efficacy Doxycycline + rifampicin had higher relapse risk than triple therapy with streptomycin: RR 22.12 (95% CI 3.48–140.52); and with levofloxacin: RR 4.61 (95% CI 2.20–9.66) Human brucellosis, 34 studies, 4,182 participants Systematic review and meta-analysis Maduranga 2024 Scientific Reports 2024 Aug https://doi.org/10.1038/s41598-024-69669-w (maduranga2024asystematicreview pages 3-6, maduranga2024asystematicreview pages 1-2)
Treatment comparative efficacy In NMA, doxycycline + rifampicin had higher failure risk than doxycycline + streptomycin: RR 1.96 (95% CI 1.27–3.01); doxycycline + gentamicin lower than doxycycline + rifampicin: RR 0.30 (95% CI 0.14–0.62) 31 RCTs, 4,167 patients Systematic review and network meta-analysis Silva 2024 PLOS Neglected Tropical Diseases 2024 Mar https://doi.org/10.1371/journal.pntd.0012010 (silva2024efficacyandsafety pages 18-21, silva2024efficacyandsafety pages 21-22, silva2024efficacyandsafety pages 22-24)
Treatment ranking Doxycycline + gentamicin ranked best by SUCRA (0.94), followed by triple therapy 0.87 and doxycycline + streptomycin 0.78; authors suggest 6 weeks doxycycline + 1–2 weeks gentamicin or 2–3 weeks streptomycin 43 RCTs, 4,283 patients Systematic review and network meta-analysis Huang 2024 PLOS Neglected Tropical Diseases 2024 Aug https://doi.org/10.1371/journal.pntd.0012405 (huang2024updatedtherapeuticoptions pages 1-2)
Bacteremic disease treatment Oral doxycycline–rifampicin and IV gentamicin–doxycycline–rifampicin showed similar response; negative blood culture at 4 weeks 90.3%, overall recovery 93.5%, no deaths 93 adults with brucellosis bacteremia Observational comparative study Nazir 2024 Journal of University Medical & Dental College 2024 Aug https://doi.org/10.37723/jumdc.v15i3.920 (nazir2024responseofthe pages 1-2)

Table: This table compiles recent quantitative evidence on brucellosis burden, epidemiology, diagnostics, and treatment efficacy. It is designed as a compact reference for knowledge-base population and citation tracing.

1. Disease information

1.1 What is brucellosis?

Brucellosis is a zoonotic, often insidious, multisystem infectious disease caused by bacteria of the genus Brucella. Contemporary clinical reviews emphasize its protean manifestations and diagnostic difficulty because presentations overlap with other febrile illnesses (Ayoubi et al., Jul 2024, Current Opinion in Infectious Diseases, https://doi.org/10.1097/QCO.0000000000001045) (ayoubi2024themanyfaces pages 1-2).

1.2 Common synonyms / alternative names

A 2024 clinical review explicitly lists: “Mediterranean flaccid fever,” “Malta fever,” and “undulant fever.” (Ayoubi et al., Jul 2024, https://doi.org/10.1097/QCO.0000000000001045) (ayoubi2024themanyfaces pages 1-2).

1.3 Key identifiers (OMIM / Orphanet / ICD / MeSH / MONDO)

  • ICD-10 / ICD-11 / MeSH / MONDO / Orphanet: Not extractable with citable evidence from the retrieved corpus in this run. This report therefore does not assert specific codes without evidence.
  • Evidence note: The retrieved peer‑reviewed sources focus on epidemiology, diagnostics, treatment, and One Health and do not provide standardized ontology IDs in the extracted text (ayoubi2024themanyfaces pages 1-2, qureshi2023brucellosisepidemiologypathogenesis pages 1-2).

1.4 Evidence source type

The information synthesized here is derived from aggregated disease-level resources (systematic reviews/meta-analyses, national surveillance analyses, and modeling studies) and some observational clinical studies, rather than patient‑level EHR-only sources (freire2024diagnosisofhuman pages 9-11, weinberger2024nationalepidemiologyof pages 1-2, laine2023globalestimateof pages 1-2).

2. Etiology

2.1 Disease causal factors

  • Cause: Infection by Brucella spp. (Gram-negative, facultative intracellular bacteria) (huang2024updatedtherapeuticoptions pages 1-2, ayoubi2024themanyfaces pages 1-2).
  • Human-pathogenic species emphasized in recent reviews: B. melitensis, B. canis, B. abortus, and B. suis (ayoubi2024themanyfaces pages 1-2, moriyon2023brucellosisandone pages 1-2).

2.2 Transmission and risk factors (human)

A 2024 review provides a broad, explicit list of transmission routes: - “direct contact with infected animal body fluids,” - “consumption of unpasteurized dairy products and contaminated meats,” - “inhalation of infected aerosol particles,” - “sexual contact, breast milk, vertical transmission, bone marrow transplantation, and transfusion of blood products” (Ayoubi et al., Jul 2024, https://doi.org/10.1097/QCO.0000000000001045) (ayoubi2024themanyfaces pages 1-2).

Occupational and foodborne risk are strongly emphasized by One Health sources: the general public is mainly affected by “consuming raw milk and unpasteurized dairy products,” whereas at-risk groups include “breeders and their families, veterinarians, laboratory personnel and dairy and slaughterhouse workers” (Moriyón et al., Aug 2023, Microorganisms, https://doi.org/10.3390/microorganisms11082070) (moriyon2023brucellosisandone pages 1-2).

Risk groups in global incidence modeling: “raw milk–product consumers, livestock owners, abattoir workers, and veterinarians” (Laine et al., Sep 2023, https://doi.org/10.3201/eid2909.230052) (laine2023globalestimateof pages 1-2).

2.3 Protective factors

Direct evidence for protective genetic variants or protective environmental factors was not present in the citable excerpts retrieved. However, prevention evidence strongly implies pasteurization and animal control measures reduce risk (moriyon2023brucellosisandone pages 1-2, qureshi2023brucellosisepidemiologypathogenesis pages 1-2).

2.4 Gene–environment interactions

No citable human GxE association results were retrieved in the current corpus; therefore, no specific GxE claims are made.

3. Phenotypes (clinical manifestations)

3.1 Core symptom complex and focal disease

Across recent evidence, typical illness is described as nonspecific and influenza-like: - “undulating fever, sweats, fatigue, and malaise” (Laine et al., Sep 2023) (laine2023globalestimateof pages 1-2). A 2024 global prevalence review also lists common manifestations (fever/fatigue/joint pain) and notes complications including endocarditis and arthritis (sherasiya2024globalprevalenceof pages 1-4).

A 2024 clinical review highlights the multi-system nature and the breadth of complications, emphasizing the need for a comprehensive diagnostic approach (ayoubi2024themanyfaces pages 1-2).

3.2 Temporal development / course

Evidence on untreated, asymptomatic seropositive individuals (useful for temporal course and secondary prevention) shows a meaningful risk of developing symptoms: - Pooled prevalence of “appearing symptomatic was 15.4% (95% CI 2.1%–34.3%)” over “0.5–18 months,” and risk increases with follow-up duration (Li et al., Mar 2023, Emerging Microbes & Infections, https://doi.org/10.1080/22221751.2023.2185464) (li2023followupoutcomesof pages 1-2).

3.3 Quality-of-life impact

Direct validated QoL instrument statistics (e.g., SF‑36/EQ‑5D) were not present in the retrieved excerpts. Nevertheless, contemporary therapeutic reviews emphasize brucellosis’ “debilitating and disabling potential” and socioeconomic impact (Silva et al., Mar 2024) (silva2024efficacyandsafety pages 18-21).

3.4 HPO term suggestions (mapping)

These are ontology mapping suggestions based on the clinical descriptions in the cited sources: - Fever: HP:0001945 (from “undulating fever”) (laine2023globalestimateof pages 1-2) - Hyperhidrosis / sweats: HP:0000975 (laine2023globalestimateof pages 1-2) - Fatigue: HP:0012378 (laine2023globalestimateof pages 1-2) - Malaise: HP:0033834 (laine2023globalestimateof pages 1-2) - Arthralgia: HP:0002829 (implied by joint pain/arthritis) (sherasiya2024globalprevalenceof pages 1-4) - Arthritis: HP:0001369 (sherasiya2024globalprevalenceof pages 1-4) - Endocarditis: HP:0100584 (sherasiya2024globalprevalenceof pages 1-4) - Meningitis/encephalitis (neurobrucellosis complications referenced): HP:0001287 / HP:0002383 (sherasiya2024globalprevalenceof pages 1-4)

4. Genetic / molecular information

Brucellosis is an infectious disease (no single human causal gene). Molecular information is therefore focused on pathogen virulence and host-response pathways.

4.1 Key mechanistic concepts (current understanding)

  • Brucella spp. are intracellular pathogens that survive in host cells (including macrophages), enabling persistence and chronicity (huang2024updatedtherapeuticoptions pages 1-2, ayoubi2024themanyfaces pages 1-2).
  • Host immune evasion and antigen presentation modulation: A 2024 mechanistic study reports that Brucella abortus RNA reduces IFN-γ–induced MHC-I surface expression in multiple human cell types (bronchial/alveolar epithelium and endothelial microvasculature), and that in monocytes/macrophages this down-modulation occurs “via the pathway of the Epidermal Growth Factor Receptor (EGFR),” with partial reversal by EGFR neutralization (Serafino et al., Jul 2024, PLOS ONE, https://doi.org/10.1371/journal.pone.0306429) (racasanu2024epidemiologydiagnosistreatment pages 4-5).
  • Macrophage signaling reprogramming: A 2024 macrophage transcriptomics study reports strain-specific responses in THP-1 macrophages, including over-expression of “anti-inflammatory pathways, such as cAMP signaling and PI3K-Akt pathway” with down-regulation of inflammatory pathways involving IL1A and IL10 (Queijeiro‑Barroso et al., Nov 2024, https://doi.org/10.14715/cmb/2024.70.10.2) (qureshi2023brucellosisepidemiologypathogenesis pages 1-2).

4.2 Pathway/ontology suggestions (mapping)

GO biological process (suggested): - Antigen processing and presentation via MHC class I: GO:0002474 (racasanu2024epidemiologydiagnosistreatment pages 4-5) - Negative regulation of antigen presentation: (conceptual mapping to MHC-I down-modulation) (racasanu2024epidemiologydiagnosistreatment pages 4-5) - Regulation of cytokine production / inflammatory response: GO:0006954 (racasanu2024epidemiologydiagnosistreatment pages 4-5, qureshi2023brucellosisepidemiologypathogenesis pages 1-2)

Cell Ontology (CL) suggestions: - Macrophage: CL:0000235 (intracellular niche; THP‑1 model) (qureshi2023brucellosisepidemiologypathogenesis pages 1-2) - Monocyte: CL:0000576 (racasanu2024epidemiologydiagnosistreatment pages 4-5) - Endothelial cell: CL:0000115 (racasanu2024epidemiologydiagnosistreatment pages 4-5) - Epithelial cell (bronchial/alveolar): CL:0000066 (racasanu2024epidemiologydiagnosistreatment pages 4-5)

UBERON anatomy suggestions (based on implicated tissues): - Spleen (common systemic organ involvement and pathogen reservoir concept in literature; also a major immune organ): UBERON:0002106 (supported indirectly by systemic infection framing and bacteremia) (laine2023globalestimateof pages 1-2, weinberger2024nationalepidemiologyof pages 1-2) - Lung / respiratory epithelium: UBERON:0002048 (racasanu2024epidemiologydiagnosistreatment pages 4-5) - Blood (bacteremia): UBERON:0000178 (weinberger2024nationalepidemiologyof pages 1-2)

5. Environmental information

5.1 Environmental/occupational factors

Risk is strongly tied to livestock production systems and occupational exposure. A national analysis in Israel describes community-level risk in sectors with small ruminant herding and unpasteurized dairy distribution, and demonstrates strong demographic disparities in incidence by ethnic sector (Weinberger et al., May 2024, https://doi.org/10.1017/S0950268824000803) (weinberger2024nationalepidemiologyof pages 1-2, weinberger2024nationalepidemiologyof pages 2-3).

5.2 Lifestyle factors

Consumption of unpasteurized milk and dairy products is repeatedly identified as a dominant lifestyle-related exposure risk (moriyon2023brucellosisandone pages 1-2, ayoubi2024themanyfaces pages 1-2).

5.3 Infectious agent(s)

  • Pathogen genus: Brucella spp. (ayoubi2024themanyfaces pages 1-2).

6. Mechanism / pathophysiology (causal chain)

6.1 Causal chain (high-level)

1) Exposure via raw dairy, animal secretions/tissues, aerosols, or rarely vertical routes (ayoubi2024themanyfaces pages 1-2, moriyon2023brucellosisandone pages 1-2). 2) Entry and dissemination with frequent bloodstream involvement in culture-confirmed national data (Israel: 99.8% bacteraemic isolates) (weinberger2024nationalepidemiologyof pages 2-3). 3) Intracellular survival in immune cells (macrophages/monocytes) with host signaling shifts toward anti-inflammatory profiles (cAMP, PI3K-Akt) in some strain contexts (qureshi2023brucellosisepidemiologypathogenesis pages 1-2). 4) Immune evasion including reduced MHC-I surface expression in multiple cell types, potentially reducing CD8+ T cell surveillance; EGFR pathway implicated in this modulation (racasanu2024epidemiologydiagnosistreatment pages 4-5). 5) Clinical manifestations as systemic inflammatory illness (fever/sweats/fatigue) and potential focal complications (arthritis/endocarditis/neuroinfection) (laine2023globalestimateof pages 1-2, sherasiya2024globalprevalenceof pages 1-4).

6.2 Recent developments (2023–2024)

  • Expansion of diagnostic technologies and algorithms (TR-FRET/FPA/artificial antigens) highlighted as active areas in 2024 expert review (ayoubi2024themanyfaces pages 1-2).
  • Mechanistic work in 2024 demonstrates immune evasion beyond macrophages (epithelium/endothelium) (racasanu2024epidemiologydiagnosistreatment pages 4-5).

7. Anatomical structures affected

Based on clinical syndrome and mechanistic evidence, key involved systems include: - Blood / systemic circulation: frequent bacteremia in culture-confirmed series (weinberger2024nationalepidemiologyof pages 1-2). - Musculoskeletal system: joint pain/arthritis common in clinical descriptions (sherasiya2024globalprevalenceof pages 1-4). - Cardiovascular system: endocarditis as a recognized severe complication (sherasiya2024globalprevalenceof pages 1-4). - Nervous system: meningitis/encephalitis described as possible complications (sherasiya2024globalprevalenceof pages 1-4). - Respiratory epithelium and microvascular endothelium: implicated in immune evasion study (racasanu2024epidemiologydiagnosistreatment pages 4-5).

Suggested UBERON mappings (see Section 4.2).

8. Temporal development

  • Onset: Often insidious/nonspecific (laine2023globalestimateof pages 1-2).
  • Course patterns: Can be acute or evolve with focal complications; relapse/failure is a key clinical concern driving multi-week combination therapy and comparative-effectiveness research (silva2024efficacyandsafety pages 18-21, maduranga2024asystematicreview pages 3-6).
  • Asymptomatic seropositivity: Meta-analysis indicates nontrivial progression to symptomatic disease over months, rising with longer follow-up (li2023followupoutcomesof pages 1-2).

9. Inheritance and population

Not applicable as a Mendelian inherited disorder. Population characteristics are therefore epidemiologic.

9.1 Epidemiology: global and regional statistics

  • Global incidence estimate (model-based): “2.1 million” cases/year (Laine et al., Sep 2023) (laine2023globalestimateof pages 1-2).
  • Global prevalence synthesis (study-based): pooled prevalence 15.49% (95% CI 12.01–18.97) across 69 studies (Sherasiya, Sep 2024, preprint) (sherasiya2024globalprevalenceof pages 1-4).
  • Israel (2004–2022): 2,489 culture-confirmed cases; 64% male; mean age 30.5 years; incidence 1.6/100,000 overall, with major disparities (Arab 6.6/100,000; Jewish 0.18/100,000; IRR 36.4) (Weinberger et al., May 2024) (weinberger2024nationalepidemiologyof pages 1-2).
  • Ethiopia (2015–2024): pooled seroprevalence overall 5.0%; human 6.9%; cattle 3.5% (Dagnaw et al., Dec 2024, https://doi.org/10.1186/s12889-024-21042-2) (dagnaw2024humanandanimal pages 1-2).

10. Diagnostics

10.1 Clinical and laboratory diagnosis: current evidence and performance

Freire et al. (2024) conducted a diagnostic test accuracy systematic review/meta-analysis and report high pooled performance for several tests (very low certainty overall): - Rose Bengal vs culture: sensitivity 89.7%, specificity 94.1%; vs culture and/or SAT: sensitivity 96.6%, specificity 97.9% (freire2024diagnosisofhuman pages 9-11). - SAT vs culture: sensitivity 89.2%, specificity 95.6% (freire2024diagnosisofhuman pages 9-11). - IgG ELISA vs culture: sensitivity 82.9%, specificity 96.2% (freire2024diagnosisofhuman pages 9-11). - PCR: qualitative PCR vs culture sensitivity 96.4%, specificity 98.1%; real-time PCR sensitivity 81.9%, specificity 91.5% (freire2024diagnosisofhuman pages 9-11).

10.2 Real-world diagnostic algorithms (implementation)

A French National Reference Center study (sera June 2012–June 2023) shows a practical algorithmic approach can deliver very high diagnostic performance: - Algorithm combining RBT + Brucellacapt + ELISA (IgM/IgG) achieved 90.5% sensitivity, 99.7% specificity, 92.4% PPV, 99.6% NPV (Loubet et al., Sep 2024, https://doi.org/10.1371/journal.pntd.0012442) (loubet2024diagnosisofbrucellosis pages 1-2).

10.3 Expert analysis (interpretation challenges)

A 2024 expert review highlights advances (FPA, TR‑FRET, artificial antigens) but notes serology interpretation remains challenging (e.g., immunosuppression, blocking antibodies, prozone) and stresses a comprehensive diagnostic approach (ayoubi2024themanyfaces pages 1-2).

10.4 Differential diagnosis

Not systematically enumerated in the retrieved excerpts; however, the core problem of nonspecific febrile illness and the need for combined clinical + laboratory evaluation is emphasized (laine2023globalestimateof pages 1-2, ayoubi2024themanyfaces pages 1-2).

11. Outcome / prognosis

11.1 Mortality and severe outcomes

  • Bacteremic cohort study (n=93) reported “No death” during the observed period; negative blood culture at 4 weeks 90.3%, recovery 93.5% (Nazir et al., Aug 2024, https://doi.org/10.37723/jumdc.v15i3.920) (nazir2024responseofthe pages 1-2). This is context-specific and not a global mortality estimate.

11.2 Relapse and treatment failure (key prognostic concern)

Relapse/failure drives guideline emphasis on combination therapy and adequate duration. - Doxycycline+rifampicin vs doxycycline+streptomycin: higher failure risk with doxycycline+rifampicin (RR 1.96, 95% CI 1.27–3.01) (Silva et al., Mar 2024) (silva2024efficacyandsafety pages 18-21).

11.3 Progression from asymptomatic infection

Untreated asymptomatic cases can become symptomatic over months (pooled 15.4%), with increasing rates at longer follow-up (li2023followupoutcomesof pages 1-2).

12. Treatment

12.1 Current applications and real-world implementations

Combination antibiotic therapy over weeks is standard, reflecting intracellular persistence and relapse risk. WHO guidance is referenced in recent observational work as recommending “doxycycline with rifampicin or an aminoglycoside” (Nazir et al., 2024) (nazir2024responseofthe pages 1-2).

12.2 Comparative effectiveness (2024 evidence)

Meta-analysis of comparative clinical studies (Maduranga et al., Aug 2024): - Doxycycline+rifampicin had higher treatment failure risk than triple therapy adding streptomycin (RR 1.98, 95% CI 1.17–3.35) and adding levofloxacin (RR 2.98, 95% CI 1.67–5.32) (maduranga2024asystematicreview pages 1-2). - Doxycycline+rifampicin had markedly higher relapse risk vs triple therapy adding streptomycin (RR 22.12, 95% CI 3.48–140.52) and levofloxacin (RR 4.61, 95% CI 2.20–9.66) (maduranga2024asystematicreview pages 3-6).

Network meta-analysis (Silva et al., Mar 2024): - Doxycycline+rifampicin had higher failure risk than doxycycline+streptomycin (RR 1.96, 95% CI 1.27–3.01) (silva2024efficacyandsafety pages 18-21). - Doxycycline+gentamicin lower risk than doxycycline+rifampicin (RR 0.30, 95% CI 0.14–0.62) (silva2024efficacyandsafety pages 18-21).

Network meta-analysis (Huang et al., Aug 2024): - Ranking by SUCRA suggested doxycycline + gentamicin as best (0.94), then triple therapy (0.87), then doxycycline + streptomycin (0.78), and the authors state: “6 weeks of doxycycline plus 1 to 2 weeks of gentamicin or plus 2 to 3 weeks of streptomycin is the best therapy” (Huang et al., Aug 2024, https://doi.org/10.1371/journal.pntd.0012405) (huang2024updatedtherapeuticoptions pages 1-2).

12.3 Emerging/experimental strategies (expert opinion)

A 2024 expert review describes “evolving treatment regimens such as the use of hydroxychloroquine as part of triple therapy” and nano-delivery systems as approaches to reduce relapse and manage chronic cases (Ayoubi et al., Jul 2024) (ayoubi2024themanyfaces pages 1-2).

12.4 MAXO term suggestions (mapping)

  • Antibiotic therapy: MAXO:0001026 (anti-bacterial drug therapy)
  • Combination antibiotic therapy: (combination therapy concept)
  • Serologic testing / diagnostic assay: (diagnostic procedure concept)

(Note: MAXO identifiers are provided as mapping suggestions; specific IDs beyond general action terms were not present in the retrieved corpus.)

13. Prevention

13.1 Primary prevention

One Health sources emphasize that prevention must target animal reservoirs and food safety. - “The general public is mainly affected by consuming raw milk and unpasteurized dairy products” (Moriyón et al., Aug 2023) (moriyon2023brucellosisandone pages 1-2). - One Health implementation requires coordinated actors and correct use of “diagnostic, epidemiological and prophylactic tools” (moriyon2023brucellosisandone pages 1-2).

13.2 Secondary prevention

  • Active screening and follow-up for seropositive individuals may be important in some contexts given progression risk (li2023followupoutcomesof pages 1-2).

13.3 Tertiary prevention

  • Preventing relapse and focal complications relies on using effective combination regimens and adequate duration, supported by 2024 comparative evidence (maduranga2024asystematicreview pages 3-6, silva2024efficacyandsafety pages 18-21, huang2024updatedtherapeuticoptions pages 1-2).

14. Other species / natural disease

Brucellosis is fundamentally a multi-host zoonosis. - Reservoir breadth: beyond classic domestic hosts, brucellae infect “ruminants, swine, and dogs,” and additional hosts include “camelids, seal and cetacean species… amphibians, foxes… desert rodent species, cave-dwelling bats and other wild animals” (Moriyón et al., Aug 2023) (moriyon2023brucellosisandone pages 1-2).

15. Model organisms

Direct, detailed model-organism phenotyping and limitations were not present in the citable excerpts used here. However, the retrieved 2024 mechanistic evidence demonstrates common experimental systems in active use: - Human macrophage-like cell models (THP‑1) for transcriptomics and pathway analysis (qureshi2023brucellosisepidemiologypathogenesis pages 1-2). - Human epithelial and endothelial cell lines to study immune evasion mechanisms (racasanu2024epidemiologydiagnosistreatment pages 4-5).

Notes on evidence limits and missing items

1) Ontology identifiers (MONDO/MeSH/ICD/Orphanet) are not included because no citable extracted text in the current corpus provided them; they should be added from authoritative ontology resources in a follow-on curation step. 2) Several mechanistic claims are necessarily high-level given the excerpt-limited access; where pathway/cell-type/GO/CL/UBERON mappings are suggested, they are presented as mappings rather than asserted as experimentally proven beyond the cited text. 3) Some sources retrieved are preprints (e.g., Sherasiya 2024); quantitative results from such sources should be interpreted with appropriate caution.

Key quoted abstract statements (verbatim excerpts)

  • Global incidence: “An evidence-based conservative estimate of the annual global incidence is 2.1 million” (Laine et al., Sep 2023) (laine2023globalestimateof pages 1-2).
  • Diagnostic algorithm performance: algorithm combining RBT, Brucellacapt, ELISA (IgM/IgG) achieved “90.5% for sensitivity, 99.7% for specificity” (Loubet et al., Sep 2024) (loubet2024diagnosisofbrucellosis pages 1-2).
  • Asymptomatic progression: pooled prevalence of “appearing symptomatic was 15.4%” (Li et al., Mar 2023) (li2023followupoutcomesof pages 1-2).
  • Treatment ranking statement: “6 weeks of doxycycline plus 1 to 2 weeks of gentamicin or plus 2 to 3 weeks of streptomycin is the best therapy” (Huang et al., Aug 2024) (huang2024updatedtherapeuticoptions pages 1-2).

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