Update data/rag/knowledge_base/Clostridioides/difficile.json
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data/rag/knowledge_base/Clostridioides/difficile.json
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{
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"genus": "Clostridioides",
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"species": "difficile",
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"full_name": "Clostridioides difficile",
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"clinical_significance": "The causative agent of C. difficile infection (CDI), including antibiotic-associated diarrhea, pseudomembranous colitis, fulminant colitis, and toxic megacolon. Major healthcare-associated pathogen with significant morbidity and mortality. Spread enhanced by highly resistant environmental spores.",
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"phenotype_profile": {
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"morphology": "Gram-positive rods with subterminal spores; may appear Gram-variable after 24 hours.",
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"culture": "Yellowish, ground-glass colonies with horse-stable odor. Fluoresces chartreuse under UV. Grows on CCFA/CHROMID C. difficile media.",
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"biochemical": [
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"Strict anaerobe",
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"Catalase negative",
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"Indole negative",
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"Motile (flagellated)",
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"No growth in 6.5% NaCl",
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"Ferments amino acids and produces p-cresol"
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]
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},
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"differentiation": {
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"from close species": [
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"Toxin genes tcdA and tcdB define pathogenic strains.",
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"Binary toxin (CDT) in hypervirulent strains (e.g., ribotype 027).",
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"Fluorescent colonies under UV differentiate from many anaerobes.",
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"Has a distinctive odor unlike C. mangenotii."
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],
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"from other genera": [
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"Bacteroides are Gram-negative and non-spore-forming.",
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"Clostridium perfringens is lecithinase positive and grows more rapidly.",
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"Peptoclostridium difficile (old name) is no longer taxonomically valid."
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]
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},
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"virulence_factors": [
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"Toxin A (TcdA): enterotoxin causing fluid secretion",
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"Toxin B (TcdB): cytotoxin causing cell rounding and death",
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"Binary toxin (CDT) in hypervirulent strains",
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"Spore formation enabling environmental persistence",
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"Adhesins enabling colonization during antibiotic disruption"
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],
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"confirmation_methods": [
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"PCR for tcdA/tcdB genes",
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"GDH antigen + toxin EIA algorithm",
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"Tissue culture cytotoxicity assay",
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"MALDI-TOF MS for organism ID"
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],
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"treatment_notes": [
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"First-line: oral vancomycin or fidaxomicin",
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"Metronidazole only for mild disease or when other agents unavailable",
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"Fecal microbiota transplantation (FMT) for recurrent CDI",
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"Bezlotoxumab adjunct for recurrence reduction"
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],
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"notes": "Hypervirulent strains (e.g., BI/NAP1/027) have increased toxin production, higher recurrence, and increased severity.",
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"references": [
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"IDSA/SHEA CDI treatment guidelines",
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"C. difficile pathogenesis literature",
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"Epidemiology of hypervirulent strains"
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]
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}
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