{ "schema_version": "1.0", "level": "genus", "genus": "Anaerococcus", "overview": { "short": "Anaerococcus species are Gram-positive anaerobic cocci, commonly isolated from skin, soft tissue, and genitourinary tract infections.", "clinical_context": "Frequently recovered from polymicrobial anaerobic infections, including abscesses, wound infections, and genital tract specimens." }, "expected_fields": { "Gram Stain": "Positive", "Shape": "Cocci", "Motility": "Negative", "Capsule": "Variable", "Spore Formation": "Negative", "Haemolysis": "Variable", "Haemolysis Type": "Variable", "Media Grown On": [ "Blood Agar", "Anaerobic Blood Agar" ], "Colony Morphology": [ "Small", "Grey", "Smooth" ], "Oxygen Requirement": "Anaerobic", "Growth Temperature": "35//37", "Catalase": "Negative", "Oxidase": "Negative", "Indole": "Variable", "Urease": "Negative", "Citrate": "Negative", "Methyl Red": "Unknown", "VP": "Unknown", "H2S": "Negative", "DNase": "Negative", "ONPG": "Negative", "Coagulase": "Negative", "Gelatin Hydrolysis": "Variable", "Esculin Hydrolysis": "Negative", "Nitrate Reduction": "Variable", "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": "Negative", "Rhamnose Fermentation": "Negative", "Arabinose Fermentation": "Negative", "Raffinose Fermentation": "Negative", "Trehalose Fermentation": "Variable", "Inositol Fermentation": "Negative", "Gas Production": "Variable", "TSI Pattern": "Unknown", "Colony Pattern": "Unknown", "Pigment": "None", "Motility Type": "Unknown" }, "field_notes": { "Oxygen Requirement": "Strict anaerobes; growth in oxygenated conditions argues against Anaerococcus.", "Catalase": "Typically negative, helping differentiate from some other Gram-positive cocci.", "Shape": "Often seen as cocci in clusters, pairs, or short chains." }, "key_differentiators": [ { "field": "Oxygen Requirement", "expected": "Anaerobic", "distinguishes_from": ["Staphylococcus", "Streptococcus"], "notes": "Strict anaerobic growth differentiates Anaerococcus from most aerobic cocci." }, { "field": "Catalase", "expected": "Negative", "distinguishes_from": ["Staphylococcus"], "notes": "Catalase negativity supports anaerobic cocci identification." } ], "common_confusions": [ { "genus": "Finegoldia", "reason": "Both are Gram-positive anaerobic cocci commonly isolated from similar clinical sites." }, { "genus": "Peptoniphilus", "reason": "Overlapping anaerobic coccal morphology and biochemical inactivity." } ], "when_to_question_identification": [ "Growth under aerobic conditions argues against Anaerococcus.", "Catalase positivity suggests another Gram-positive coccus.", "Spore formation excludes Anaerococcus." ], "recommended_next_tests": [ { "test": "Anaerobic incubation confirmation", "reason": "Confirms obligate anaerobic growth." }, { "test": "MALDI-TOF MS", "reason": "Reliable identification among anaerobic cocci with overlapping biochemistry." }, { "test": "16S rRNA sequencing", "reason": "Useful for definitive identification in complex polymicrobial infections." } ], "supported_species": [ "prevotii", "vaginalis" ] }