{ "schema_version": "1.0", "level": "species", "genus": "Bacillus", "species": "anthracis", "overview": { "short": "Bacillus anthracis is a non-motile, encapsulated, Gram-positive spore-forming rod and the causative agent of anthrax.", "clinical_context": "A high-consequence pathogen requiring immediate public health notification." }, "expected_fields": { "Gram Stain": "Positive", "Shape": "Rods", "Motility": "Negative", "Capsule": "Positive", "Spore Formation": "Positive", "Haemolysis": "Negative", "Haemolysis Type": "None", "Media Grown On": [ "Blood Agar" ], "Colony Morphology": [ "Large", "Non-haemolytic", "Ground-glass" ], "Oxygen Requirement": "Aerobic", "Growth Temperature": "35//37", "Catalase": "Positive", "Oxidase": "Variable", "Indole": "Negative", "Urease": "Negative", "Citrate": "Variable", "Methyl Red": "Variable", "VP": "Negative", "H2S": "Negative", "DNase": "Negative", "ONPG": "Negative", "Coagulase": "Negative", "Gelatin Hydrolysis": "Positive", "Esculin Hydrolysis": "Negative", "Nitrate Reduction": "Positive", "NaCl Tolerant (>=6%)": "Negative", "Lipase Test": "Negative", "Lysine Decarboxylase": "Negative", "Ornithine Decarboxylase": "Negative", "Ornitihine Decarboxylase": "Negative", "Arginine dihydrolase": "Negative", "Glucose Fermentation": "Variable", "Lactose Fermentation": "Negative", "Sucrose Fermentation": "Negative", "Maltose Fermentation": "Variable", "Mannitol Fermentation": "Negative", "Sorbitol Fermentation": "Negative", "Xylose Fermentation": "Negative", "Rhamnose Fermentation": "Negative", "Arabinose Fermentation": "Negative", "Raffinose Fermentation": "Negative", "Trehalose Fermentation": "Negative", "Inositol Fermentation": "Negative", "Gas Production": "Negative", "TSI Pattern": "Unknown", "Colony Pattern": "Unknown", "Pigment": "None", "Motility Type": "None" }, "species_markers": [ { "field": "Motility", "value": "Negative", "importance": "critical", "notes": "Non-motility is a key discriminator from B. cereus group." }, { "field": "Haemolysis", "value": "Negative", "importance": "critical", "notes": "Non-haemolytic colonies strongly suggest B. anthracis." }, { "field": "Capsule", "value": "Positive", "importance": "critical", "notes": "Poly-D-glutamate capsule is a defining virulence factor." } ], "common_confusions": [ { "species": "Bacillus cereus", "reason": "Close genetic relationship but differs in motility and haemolysis." } ], "when_to_question_identification": [ "Any haemolysis excludes B. anthracis.", "Motility excludes B. anthracis.", "Pigment production argues against B. anthracis." ], "recommended_next_tests": [ { "test": "Gamma phage susceptibility", "reason": "Highly specific for Bacillus anthracis.", "api_kit": "Not applicable (reference laboratory assay)" }, { "test": "Capsule demonstration", "reason": "Confirms virulence-associated capsule." }, { "test": "PCR for anthrax toxin genes", "reason": "Definitive confirmation in reference laboratories." } ] }