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: Scabies
MONDO ID: (if available)
Category: Infectious Disease

Research Objectives

Please provide a comprehensive research report on Scabies 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

Scabies — Comprehensive Disease Characteristics Report (2023–2024 prioritized)

Target disease

Disease name: Scabies
Category: Infectious disease (ectoparasitic infestation)
Causal agent: Sarcoptes scabiei var. hominis (mite) (mitchell2024scabiescurrentknowledge pages 1-2, schneider2023prevalenceofscabies pages 1-2)
MONDO ID: Not retrieved from the tool-accessible literature set in this run (gap).

1. Disease information

Concise overview (current understanding)

Scabies is a parasitic skin disease caused by infestation with the mite Sarcoptes scabiei var. hominis, characterized clinically by pruritus and typical lesion distributions, and it can lead to secondary bacterial skin infections such as impetigo. (mitchell2024scabiescurrentknowledge pages 1-2, li2024thedisabilityadjustedlife pages 1-2)

WHO/NTD status: Scabies was added to the WHO neglected tropical diseases (NTD) portfolio in 2017, and it is included in NTD control discussions and targets toward 2030. (mitchell2024scabiescurrentknowledge pages 1-2, sharaf2024scabiesvaccineswhere pages 1-2)

Key identifiers (ontology / coding)

IACS (International Alliance for the Control of Scabies) diagnostic framework: Three diagnostic certainty levels are widely referenced: confirmed, clinical, suspected. (engelman2021aframeworkfor pages 2-4, li2024thedisabilityadjustedlife pages 1-2)
ICD / MeSH / MONDO: Not reliably extractable from the retrieved evidence set in this run; should be populated from ICD/MeSH/MONDO registries directly (gap).

Common synonyms / alternative names

Crusted scabies is also described as Norwegian scabies in clinical and guideline literature. (simonart2024escalatingthreatof pages 1-5)

Evidence source type

Most content here is derived from aggregated disease-level resources (systematic reviews, WHO/NTD frameworks, GBD analyses, guidelines) rather than individual EHR-only sources. (li2024thedisabilityadjustedlife pages 1-2, engelman2021aframeworkfor pages 2-4, mitchell2024scabiescurrentknowledge pages 1-2)

2. Etiology

Primary cause

Infestation by Sarcoptes scabiei var. hominis; gravid females burrow in the stratum corneum and lay eggs; clinical manifestations are driven largely by host inflammatory/hypersensitivity responses. (mitchell2024scabiescurrentknowledge pages 1-2, engelman2021aframeworkfor pages 2-4, sharaf2024scabiesimmunopathogenesisand pages 4-6)

Transmission (infectious / environmental)

Direct skin-to-skin contact is the primary route; indirect transmission via contaminated items is possible but less prominent. (li2024thedisabilityadjustedlife pages 1-2, mitchell2024scabiescurrentknowledge pages 1-2)

Timing: Symptom onset can be delayed in first infestation (up to 4–8 weeks), and more rapid (days) with prior exposure. (mitchell2024scabiescurrentknowledge pages 1-2)

Risk factors (recent and authoritative)

Consistent risk factors across recent reviews and epidemiologic studies include: - Overcrowding / communal living (e.g., schools, prisons, aged care facilities, refugee camps) (mitchell2024scabiescurrentknowledge pages 1-2, li2024thedisabilityadjustedlife pages 1-2) - Poverty / low socioeconomic status and limited access to clean water (li2024thedisabilityadjustedlife pages 1-2, dejen2024assessmentofscabies pages 1-2) - Immunosuppression (increases risk of crusted scabies and major transmission) (mitchell2024scabiescurrentknowledge pages 1-2, simonart2024escalatingthreatof pages 1-5)

Quantified risk factor evidence (example; community study): In southern Ethiopia (Sept–Nov 2023 survey), scabies odds were higher with low/middle wealth index, overcrowding index >1.5, unimproved water source, washing hands with water only, and sleeping on the floor. (dejen2024assessmentofscabies pages 1-2)

Protective factors (emerging)

A case-control study in southwest Ethiopia reported higher daily household water consumption (≥25 L per person/day) as strongly protective (AOR 0.06). (dejen2024assessmentofscabies pages 2-4)

Genetic risk/protective factors & gene–environment interaction

Scabies is not primarily a Mendelian genetic disease; however, host immune genetic variation may influence susceptibility. A 2024 study of 154 patients (Iraq; 2022–2023) reported cytokine polymorphism associations including IL-10 GA genotype protective (OR 0.61) and IL-13 TT genotype associated with susceptibility (OR 2.14). (sharaf2024scabiesimmunopathogenesisand pages 2-4)

Interpretation: these findings suggest a gene–environment interaction where exposure (crowding/contact) intersects with host immune regulation (Th2/anti-inflammatory cytokine pathways) to shape risk and/or severity, but replication across populations is needed. (sharaf2024scabiesimmunopathogenesisand pages 2-4, sharaf2024scabiesimmunopathogenesisand pages 4-6)

3. Phenotypes

Core phenotypes (symptoms/signs) and suggested HPO terms

Below are common scabies phenotypes with ontology suggestions; frequencies vary by setting.

1) Pruritus (often worse at night) - Type: Symptom - Characteristics: often severe; may cause insomnia and impaired QoL; particularly prominent in ordinary scabies (li2024thedisabilityadjustedlife pages 1-2, dejen2024assessmentofscabies pages 1-2) - HPO: Pruritus (HP:0000989); Insomnia (HP:0100785)

2) Papules / vesicles / pustules in characteristic sites (interdigital spaces, wrists, elbows, etc.) - Type: Clinical signs - Characteristic distribution: interdigital spaces, flexor wrists, elbows reported as frequent sites in a 2023 community survey (dejen2024assessmentofscabies pages 1-2) - HPO: Papule (HP:0200033), Vesicle (HP:0200042), Pustule (HP:0000967)

3) Burrows - Type: Physical manifestation - Role: key diagnostic clue used in simplified mapping/exam approaches (mitchell2024scabiescurrentknowledge pages 5-6) - HPO: Skin burrow (not always represented as a single HPO term; map to scabies-specific phenotype extensions if needed)

4) Crusted (Norwegian) scabies - Type: Severe clinical subtype - Characteristics: hyperkeratotic/crusted lesions, very high mite burden; may be less itchy; major outbreak risk; associated with immunosuppression or debility (simonart2024escalatingthreatof pages 1-5) - HPO: Hyperkeratosis (HP:0000962), Palmoplantar keratoderma (HP:0000982) (clinical examples supported by crusted scabies descriptions and histopathology) (sharaf2024scabiesimmunopathogenesisand media 34ad7ec0)

Severity and quality-of-life (QoL) impact

A community-based study in north-western Ethiopia (2024; 86 adults with scabies) found mean DLQI 9.2 (SD 7.6) (moderate impairment). 54.7% had moderate/severe QoL impact and 27% reported extremely severe impact; the most affected domains were “symptoms and feelings” and “daily activity”. (yirgu2024qualityoflife pages 1-2, yirgu2024qualityoflife pages 5-7)

4. Genetic / molecular information

Causal genes

Not applicable in the Mendelian sense: scabies is caused by a parasite rather than an inherited human gene defect. (mitchell2024scabiescurrentknowledge pages 1-2)

Parasite molecular mechanisms relevant to drug response (key recent development)

Permethrin tolerance/resistance via target-site mutation: Riebenbauer et al. (JEADV; July 2023; https://doi.org/10.1111/jdv.19288) reported a VGSC/VSSC “kdr-type” mutation M918L in S. scabiei var. hominis, detected in 97.0% (65/67) mites sampled from 64 patients in their dataset; the paper states the mutation “is associated with resistance of the kdr type”. (riebenbauer2023detectionofa pages 3-4, riebenbauer2023detectionofa pages 6-7)

Implication: This supports a plausible genetic basis for declining permethrin effectiveness in at least some settings and motivates resistance surveillance. (riebenbauer2023detectionofa pages 1-2)

5. Environmental information

Environmental/lifestyle contributors

Crowded living conditions and limited access to water/hygiene resources repeatedly emerge as key determinants (global review + local surveys). (mitchell2024scabiescurrentknowledge pages 1-2, dejen2024assessmentofscabies pages 1-2)

Infectious agents and co-infections

Scabies is itself an infestation; a major downstream effect is predisposition to bacterial SSTIs. Scabies-associated skin barrier disruption and immune modulation can increase risk of impetigo and other pyoderma; mites and burrows may harbor bacteria including Staphylococcus aureus and group A streptococci. (sharaf2024scabiesimmunopathogenesisand pages 7-8)

6. Mechanism / pathophysiology

High-level causal chain (current understanding)

1) Mite infestation and burrowing in the stratum corneum → deposition of mite products/antigens. (mitchell2024scabiescurrentknowledge pages 1-2, sharaf2024scabiesimmunopathogenesisand pages 4-6) 2) Innate immune activation in epidermis (keratinocytes, dendritic cells/Langerhans cells) and antigen presentation to lymph nodes → adaptive responses. (sharaf2024scabiesimmunopathogenesisand pages 2-4) 3) Inflammatory infiltrates (eosinophils, mast cells, basophils, macrophages, neutrophils) and cytokine production → pruritus and dermatitis. (sharaf2024scabiesimmunopathogenesisand pages 2-4, sharaf2024scabiesimmunopathogenesisand pages 7-8) 4) Excoriation + barrier injury + mite-mediated complement/immune modulation → secondary bacterial infection risk and systemic sequelae in some contexts. (sharaf2024scabiesimmunopathogenesisand pages 6-7, sharaf2024scabiesimmunopathogenesisand pages 7-8)

Ordinary vs crusted scabies: immune polarization

Sharaf (Parasitology Research; March 2024; https://doi.org/10.1007/s00436-024-08173-6) synthesizes evidence that: - Ordinary scabies is associated with Th1-type responses (IFN-γ, TNF-α, IL-2). (sharaf2024scabiesimmunopathogenesisand pages 4-6) - Crusted scabies is associated with Th2-skewed cytokines (IL-4, IL-5, IL-13; also IL-31) and dysregulated cellular immunity; Th17 axis involvement is also implicated, particularly when IL-10 is reduced and Treg/Th17 balance is disrupted. (sharaf2024scabiesimmunopathogenesisand pages 4-6, sharaf2024scabiesimmunopathogenesisand pages 6-7)

Mite immune evasion mechanisms described include complement inhibition (serine protease inhibitors blocking complement pathways) and induction of anti-inflammatory mediators such as IL-10 and IL-1 receptor antagonist. (sharaf2024scabiesimmunopathogenesisand pages 6-7, sharaf2024scabiesvaccineswhere pages 1-2)

Suggested ontology terms

GO biological process (examples): inflammatory response; T cell activation; type I hypersensitivity; complement activation; keratinocyte proliferation (supported by described cytokines/immune infiltrates and crusted scabies hyperkeratosis) (sharaf2024scabiesimmunopathogenesisand pages 4-6, sharaf2024scabiesimmunopathogenesisand pages 7-8)
Cell Ontology (CL) (examples): keratinocyte; Langerhans cell; dendritic cell; CD4-positive, αβ T cell; CD8-positive T cell; eosinophil; mast cell; neutrophil (sharaf2024scabiesimmunopathogenesisand pages 2-4, sharaf2024scabiesimmunopathogenesisand pages 4-6)

Visual evidence (figure/table)

A schematic summarizing immunopathogenesis and mite/host interactions (Sharaf 2024, Figure 3) is available (sharaf2024scabiesimmunopathogenesisand media 29abd1ed).
Histopathology showing crusted scabies with heavy mite infestation and hyperkeratosis (Sharaf 2024, Figure 2) is available (sharaf2024scabiesimmunopathogenesisand media 34ad7ec0).

7. Anatomical structures affected

Primary structures

Skin (epidermis/stratum corneum) is the primary site of mite burrowing and immune response. (mitchell2024scabiescurrentknowledge pages 1-2, sharaf2024scabiesimmunopathogenesisand pages 4-6)

Tissue/cell level

Epidermal keratinocytes and antigen-presenting cells (dendritic/Langerhans) initiate and shape immune responses; dermis shows mixed inflammatory infiltrates. (sharaf2024scabiesimmunopathogenesisand pages 2-4, sharaf2024scabiesimmunopathogenesisand pages 7-8)

UBERON suggestions

Skin (UBERON:0002097)
Epidermis (UBERON:0001003)
Stratum corneum (UBERON:0002068)

8. Temporal development

Onset pattern: delayed after first infestation (weeks) but rapid with reinfestation (days). (mitchell2024scabiescurrentknowledge pages 1-2)
Course: can be persistent without treatment; crusted scabies may progress with massive mite burden and prolonged undiagnosed periods, increasing outbreak risk. (simonart2024escalatingthreatof pages 1-5)

9. Inheritance and population

Global epidemiology (recent statistics)

A systematic analysis of scabies burden using GBD 2021 data (PLOS NTD; Dec 2024; https://doi.org/10.1371/journal.pntd.0012775) estimated that in 2021 scabies caused: - 5.3 million DALYs - 206.6 million prevalent cases - 622.5 million incident cases with burden concentrated in tropical regions and particularly affecting children and young people. (li2024thedisabilityadjustedlife pages 1-2)

Prevalence range in population-based surveys

A 2023 systematic review (JEADV; May 2023; https://doi.org/10.1111/jdv.19167) included 43 population-based studies and reported very wide prevalence variation, including 71.0% in five Ghanaian communities and 76.9% in an Indonesian boarding school (children-only study), with a low of 0.18% in Uganda. (schneider2023prevalenceofscabies pages 1-2)

High-risk settings

Congregate settings (schools, prisons, aged-care facilities, refugee camps) and overcrowded housing are repeatedly cited as high-risk contexts. (mitchell2024scabiescurrentknowledge pages 1-2)

10. Diagnostics

Clinical criteria / standardized case definitions

The 2020 IACS criteria provide standardized diagnostic certainty strata (confirmed/clinical/suspected) and are recommended as a standard for surveys and programs. (engelman2021aframeworkfor pages 2-4, cox2021estimatingtheglobal pages 5-9)
A community study in Ethiopia explicitly applied IACS diagnostic criteria for prevalence estimation and risk-factor analysis. (dejen2024assessmentofscabies pages 1-2)

Confirmatory tests

Microscopy of skin scrapings remains a reference standard for confirmation by identifying mites/eggs/feces, but may be impractical and have limited sensitivity in field use. (cox2021estimatingtheglobal pages 5-9, engelman2021aframeworkfor pages 2-4)

Newer/advanced diagnostic approaches (recent synthesis)

A 2024 systematic review (preprint) summarizes increased use of noninvasive imaging (dermoscopy, video dermoscopy, reflectance confocal microscopy, optical coherence tomography) and PCR assays for mite DNA as diagnostic advances. (kumari2024titleimpactof pages 28-32, kumari2024titleimpactof pages 1-4)

Differential diagnosis (high-level)

Differential diagnosis often includes other pruritic dermatoses (e.g., eczema/dermatitis) and other infestations; standardized criteria and confirmatory testing help reduce misclassification. (cox2021estimatingtheglobal pages 5-9)

LOINC/SNOMED-style test mapping (suggestions)

Not directly retrievable from the provided evidence set; suggested mapping targets include “skin scraping microscopy for mite/egg/scybala” and “PCR for Sarcoptes scabiei DNA,” to be aligned with local laboratory coding systems. (cox2021estimatingtheglobal pages 5-9, kumari2024titleimpactof pages 28-32)

11. Outcome / prognosis

Complications and morbidity

Scabies can predispose to impetigo and other SSTIs, with downstream severe outcomes in some settings (including cellulitis, lymphangitis, acute glomerulonephritis; rarely death), especially in crusted scabies with fissures and heavy infestation. (sharaf2024scabiesimmunopathogenesisand pages 7-8, simonart2024escalatingthreatof pages 1-5)

Quality of life (recent data)

As above (DLQI study; 2024 Ethiopia): mean DLQI 9.2; 27% extremely severe QoL impact. (yirgu2024qualityoflife pages 1-2, yirgu2024qualityoflife pages 5-7)

Health-system economic burden (real-world implementation)

Fiji national extrapolation from Big SHIFT surveillance (PLOS Global Public Health; Oct 2024; https://doi.org/10.1371/journal.pgph.0003706) estimated: - US$3.0 million annual direct healthcare costs attributable to scabies and related SSTIs (~US$3.3 per capita) - US$17.7 average cost per primary healthcare presentation for scabies - US$439 average cost per hospital admission for potentially scabies-related SSTI (akpan2024costsofprimary pages 1-2)

12. Treatment

Standard pharmacotherapy and regimens (current practice)

A 2024 review summarizing current practice describes: - Topical permethrin 5%: whole-body application for 8–12 hours; often repeated after 7–14 days. (mitchell2024scabiescurrentknowledge pages 5-6) - Oral ivermectin: active against mites but not eggs; short half-life necessitating repeat dosing 7–14 days apart; generally avoided in pregnancy and children <15 kg in many guidelines. (mitchell2024scabiescurrentknowledge pages 5-6) - Benzyl benzoate: topical alternative used in some programs/guidelines. (mitchell2024scabiescurrentknowledge pages 5-6)

Comparative effectiveness: A 2018 Cochrane review is summarized as finding no difference between permethrin and ivermectin in efficacy. (mitchell2024scabiescurrentknowledge pages 5-6)

Mass drug administration (MDA) as a public-health control strategy

Evidence syntheses emphasize MDA as effective in highly endemic settings. - A 2024 scabies control review describes strong evidence including a Fiji trial with 94% reduction (32% to <2%) at 12 months and a meta-analysis with relative reductions 79% for scabies and 66% for impetigo. (mitchell2024scabiescurrentknowledge pages 6-7) - A scabies control framework recommends piloting MDA at community prevalence ≥10%, with suggested stopping threshold <2% and a commonly used regimen two doses ivermectin 200 μg/kg 7–14 days apart (and topical alternatives for ineligible groups). (engelman2021aframeworkfor pages 4-5)

Drug resistance (major 2023–2024 development)

Molecular evidence: kdr-type VGSC mutation M918L associated with permethrin tolerance in human scabies mites (2023). (riebenbauer2023detectionofa pages 6-7, riebenbauer2023detectionofa pages 3-4)
Programmatic implication: the need for resistance monitoring and potential alternative strategies, including combination regimens and investigation of new oral agents. (mitchell2024scabiescurrentknowledge pages 6-7)

Emerging therapeutics / future directions

Moxidectin is highlighted as a promising oral alternative with longer half-life and potential for single-dose treatment, relevant to improving MDA feasibility and adherence. (mitchell2024scabiescurrentknowledge pages 6-7)

Treatment ontology suggestions (MAXO)

Topical antiparasitic therapy (permethrin application)
Systemic antiparasitic therapy (oral ivermectin)
Mass drug administration (community-wide ivermectin-based MDA)
Contact tracing and treatment of close contacts (these are conceptual MAXO mappings; exact IDs should be selected from MAXO catalog during curation). (mitchell2024scabiescurrentknowledge pages 5-6, engelman2021aframeworkfor pages 4-5)

Clinical trials (real-world pipeline; selected)

NCT04332068 (University of Oxford; Phase 2; started 2023-11-18; completed 2025-04-04): oral ivermectin vs permethrin in children 5 to <15 kg (includes dose escalation up to 800 μg/kg at some sites); primary outcome adverse events; includes population PK and WGS pharmacogenomics. (NCT04332068 chunk 1, NCT04332068 chunk 2)
NCT05819983 (Universitas Padjadjaran; Phase 4; completed 2023): compares 3-dose ivermectin vs 2-dose ivermectin vs permethrin 5% (days 1 and 8) in ≥6 years/≥15 kg; outcomes include lesion severity and pruritus (5 weeks); no results posted in the record excerpt. (NCT05819983 chunk 1)
NCT07145736 (Kirby Institute; recruiting; Angola; includes scabies among conditions): moxidectin vs ivermectin for MDA in onchocerciasis/other NTDs; operational eligibility information provided; no results posted. (NCT07145736 chunk 2)

13. Prevention

Individual and household prevention

Key prevention principles include rapid case identification and simultaneous treatment of close/household contacts, plus environmental measures (laundering/drying linens/clothes) that may help but have limited evidence. (mitchell2024scabiescurrentknowledge pages 5-6, mitchell2024scabiescurrentknowledge pages 6-7)

Community-level prevention (MDA thresholds)

WHO-aligned frameworks recommend: - individual/household management for prevalence <10% - community-wide MDA where prevalence is ≥10% (mitchell2024scabiescurrentknowledge pages 6-7, engelman2021aframeworkfor pages 4-5)

Cost-effectiveness threshold evidence (2024)

A decision-analytic model for Ethiopia (Frontiers in Health Services; Sep 2024; https://doi.org/10.3389/frhs.2024.1279762) found ivermectin-based MDA to be cost-effective in a base case (population 100,000; prevalence 15%) and suggested initiating MDA at prevalence >10%; MDA was not cost-effective below 10% prevalence or when effectiveness <85%. (hounsome2024costeffectivenessofmass pages 1-2)

14. Other species / natural disease

Scabies-like infestation occurs in many mammals ("sarcoptic mange"), but cross-species taxonomy, zoonotic potential, and OMIA/NCBI taxon details were not retrievable from the current evidence set and should be populated from veterinary/parasitology resources (gap).

15. Model organisms

Porcine models are used for mechanistic studies and transcriptomics; a 2023 commentary summarizes that transcriptomic analyses support Th2 signatures in both ordinary and crusted scabies and increased IL-17 pathway magnitude in crusted disease, with time-dependent immune activation patterns. (mounsey2023commentarytranscriptomeanalysis pages 2-3)

Expert opinions / analysis (authoritative synthesis)

Recent authoritative syntheses converge on several expert-level conclusions: 1) Standardized diagnosis is essential for burden estimation and control planning; IACS criteria address longstanding inconsistencies and enable mapping strategies. (cox2021estimatingtheglobal pages 5-9, engelman2021aframeworkfor pages 2-4) 2) MDA is among the most impactful control tools for high-prevalence settings, but two-dose ivermectin schedules and contraindicated groups constrain implementation; longer-acting oral agents could be transformative. (mitchell2024scabiescurrentknowledge pages 6-7, engelman2021aframeworkfor pages 4-5) 3) Resistance surveillance is now a priority: molecular evidence (VGSC kdr mutation) supports a plausible biologic basis for permethrin tolerance, reinforcing the need for monitoring and diversified treatment approaches. (riebenbauer2023detectionofa pages 6-7, mitchell2024scabiescurrentknowledge pages 6-7)

Abstract-quotable statements (verbatim snippets available from retrieved texts)

GBD 2021 (PLOS NTD; Dec 2024): “In 2021, scabies caused 5.3 million DALYs, 206.6 million prevalence, and 622.5 million incidence …” (as quoted in the evidence extraction). (li2024thedisabilityadjustedlife pages 1-2)
Riebenbauer 2023 (JEADV; Jul 2023): M918L mutation “is associated with resistance of the kdr type.” (riebenbauer2023detectionofa pages 6-7)

Limitations / gaps in this run

Ontology IDs (MONDO, MeSH, ICD-10/ICD-11) were not directly retrievable from the tool-accessible literature set and should be supplemented from dedicated ontology registries.
Some “latest” sources (e.g., certain 2024 BJD meta-analyses and Nature Reviews Disease Primers) were flagged as unobtainable in the search results and therefore could not be cited here.

References

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(NCT04332068 chunk 1): Ivermectin Safety in Small Children. University of Oxford. 2023. ClinicalTrials.gov Identifier: NCT04332068
(NCT04332068 chunk 2): Ivermectin Safety in Small Children. University of Oxford. 2023. ClinicalTrials.gov Identifier: NCT04332068
(NCT05819983 chunk 1): Ivermectin/ Permethrin for Scabies. Universitas Padjadjaran. 2023. ClinicalTrials.gov Identifier: NCT05819983
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