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"schema_version": "1.0",
"level": "genus",
"genus": "Bacillus",
"overview": {
"short": "Bacillus species are Gram-positive, aerobic or facultatively anaerobic rods that form endospores and are widely distributed in the environment.",
"clinical_context": "Includes both harmless environmental organisms and clinically significant pathogens causing foodborne illness, anthrax, and opportunistic infections."
},
"expected_fields": {
"Gram Stain": "Positive",
"Shape": "Rods",
"Motility": "Variable",
"Capsule": "Variable",
"Spore Formation": "Positive",
"Haemolysis": "Variable",
"Haemolysis Type": "Variable",
"Media Grown On": [
"Blood Agar",
"Nutrient Agar"
],
"Colony Morphology": [
"Large",
"Irregular",
"Flat"
],
"Oxygen Requirement": "Aerobic",
"Growth Temperature": "10//50",
"Catalase": "Positive",
"Oxidase": "Variable",
"Indole": "Negative",
"Urease": "Variable",
"Citrate": "Variable",
"Methyl Red": "Variable",
"VP": "Variable",
"H2S": "Negative",
"DNase": "Variable",
"ONPG": "Negative",
"Coagulase": "Negative",
"Gelatin Hydrolysis": "Positive",
"Esculin Hydrolysis": "Variable",
"Nitrate Reduction": "Variable",
"NaCl Tolerant (>=6%)": "Variable",
"Lipase Test": "Variable",
"Lysine Decarboxylase": "Negative",
"Ornithine Decarboxylase": "Negative",
"Ornitihine Decarboxylase": "Negative",
"Arginine dihydrolase": "Negative",
"Glucose Fermentation": "Variable",
"Lactose Fermentation": "Negative",
"Sucrose Fermentation": "Variable",
"Maltose Fermentation": "Variable",
"Mannitol Fermentation": "Variable",
"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": "Variable",
"Colony Pattern": "Unknown",
"Pigment": "Variable",
"Motility Type": "Peritrichous"
},
"field_notes": {
"Spore Formation": "A defining genus-level characteristic.",
"Motility": "Absent in B. anthracis but present in most other species.",
"Haemolysis": "Strong discriminator between pathogenic species."
},
"key_differentiators": [
{
"field": "Spore Formation",
"expected": "Positive",
"distinguishes_from": ["Listeria", "Corynebacterium"],
"notes": "Endospore formation is a defining Bacillus feature."
},
{
"field": "Catalase",
"expected": "Positive",
"distinguishes_from": ["Clostridium"],
"notes": "Catalase positivity helps separate Bacillus from anaerobic spore-formers."
}
],
"common_confusions": [
{
"genus": "Clostridium",
"reason": "Both form spores but differ in oxygen tolerance."
},
{
"genus": "Paenibacillus",
"reason": "Similar morphology and spore formation."
}
],
"when_to_question_identification": [
"Strict anaerobic growth suggests Clostridium.",
"Catalase negativity argues against Bacillus.",
"Absence of spores suggests misidentification."
],
"recommended_next_tests": [
{
"test": "Spore stain",
"reason": "Confirms genus-defining endospore formation."
},
{
"test": "Motility testing",
"reason": "Critical for separating Bacillus species groups."
},
{
"test": "MALDI-TOF MS",
"reason": "Most reliable for genus and species identification."
}
],
"supported_species": [
"anthracis",
"cereus",
"aubtilis",
"mycoides",
"thuringiensis"
]
} |