| { |
| "schema_version": "1.0", |
| "level": "genus", |
| "genus": "Clostridioides", |
|
|
| "overview": { |
| "short": "Clostridioides species are Gram-positive, anaerobic, spore-forming rods primarily associated with gastrointestinal environments.", |
| "clinical_context": "Most clinically significant for Clostridioides difficile, a major cause of antibiotic-associated colitis." |
| }, |
|
|
| "expected_fields": { |
| "Gram Stain": "Positive", |
| "Shape": "Rods", |
| "Motility": "Variable", |
| "Capsule": "Negative", |
| "Spore Formation": "Positive", |
| "Haemolysis": "Variable", |
| "Haemolysis Type": "Variable", |
| "Media Grown On": [ |
| "Blood Agar", |
| "CCFA Agar" |
| ], |
| "Colony Morphology": [ |
| "Irregular", |
| "Flat", |
| "Grey" |
| ], |
| "Oxygen Requirement": "Anaerobic", |
| "Growth Temperature": "25//42", |
| "Catalase": "Negative", |
| "Oxidase": "Negative", |
| "Indole": "Variable", |
| "Urease": "Negative", |
| "Citrate": "Negative", |
| "Methyl Red": "Positive", |
| "VP": "Negative", |
| "H2S": "Negative", |
| "DNase": "Negative", |
| "ONPG": "Negative", |
| "Coagulase": "Negative", |
| "Gelatin Hydrolysis": "Variable", |
| "Esculin Hydrolysis": "Variable", |
| "Nitrate Reduction": "Negative", |
| "NaCl Tolerant (>=6%)": "Negative", |
| "Lipase Test": "Negative", |
| "Lysine Decarboxylase": "Negative", |
| "Ornithine Decarboxylase": "Negative", |
| "Ornitihine Decarboxylase": "Negative", |
| "Arginine dihydrolase": "Negative", |
| "Glucose Fermentation": "Positive", |
| "Lactose Fermentation": "Variable", |
| "Sucrose Fermentation": "Variable", |
| "Maltose Fermentation": "Variable", |
| "Mannitol Fermentation": "Negative", |
| "Sorbitol Fermentation": "Negative", |
| "Xylose Fermentation": "Variable", |
| "Rhamnose Fermentation": "Negative", |
| "Arabinose Fermentation": "Variable", |
| "Raffinose Fermentation": "Negative", |
| "Trehalose Fermentation": "Variable", |
| "Inositol Fermentation": "Negative", |
| "Gas Production": "Variable", |
| "TSI Pattern": "Unknown", |
| "Colony Pattern": "Unknown", |
| "Pigment": "None", |
| "Motility Type": "Variable" |
| }, |
|
|
| "field_notes": { |
| "Spore Formation": "A defining characteristic distinguishing Clostridioides from many other anaerobes.", |
| "Oxygen Requirement": "Strict anaerobiosis is essential for growth.", |
| "Catalase": "Generally negative despite aerotolerance of spores." |
| }, |
|
|
| "key_differentiators": [ |
| { |
| "field": "Spore Formation", |
| "expected": "Positive", |
| "distinguishes_from": ["Bacteroides", "Fusobacterium"], |
| "notes": "Spore production separates Clostridioides from non-spore-forming anaerobes." |
| }, |
| { |
| "field": "Oxygen Requirement", |
| "expected": "Anaerobic", |
| "distinguishes_from": ["Bacillus"], |
| "notes": "Strict anaerobiosis differentiates from aerobic or facultative spore-formers." |
| } |
| ], |
|
|
| "common_confusions": [ |
| { |
| "genus": "Clostridium", |
| "reason": "Historical classification overlap and shared spore-forming anaerobic morphology." |
| }, |
| { |
| "genus": "Peptoclostridium", |
| "reason": "Similar anaerobic metabolism and overlapping biochemical reactions." |
| } |
| ], |
|
|
| "when_to_question_identification": [ |
| "Aerobic growth suggests Bacillus or Paenibacillus.", |
| "Non-spore-forming isolate suggests Bacteroides or other anaerobes.", |
| "Strong indole positivity may indicate another clostridial genus." |
| ], |
|
|
| "recommended_next_tests": [ |
| { |
| "test": "Anaerobic culture confirmation", |
| "reason": "Ensures strict anaerobic growth requirement." |
| }, |
| { |
| "test": "Toxin detection assay", |
| "reason": "Critical for identifying toxigenic Clostridioides difficile." |
| }, |
| { |
| "test": "MALDI-TOF MS", |
| "reason": "Reliable genus- and species-level identification." |
| } |
| ], |
|
|
| "supported_species": [ |
| "difficile", |
| "mangenotii" |
| ] |
| } |
