{ "schema_version": "1.0", "level": "genus", "genus": "Candida", "overview": { "short": "Candida species are yeast-like fungi commonly found as commensals on human mucosal surfaces but capable of causing opportunistic infections.", "clinical_context": "Associated with superficial mucocutaneous infections and invasive candidiasis, particularly in immunocompromised or hospitalized patients." }, "expected_fields": { "Gram Stain": "Positive", "Shape": "Yeast", "Motility": "Negative", "Capsule": "Negative", "Spore Formation": "Negative", "Haemolysis": "Variable", "Haemolysis Type": "Unknown", "Media Grown On": [ "Sabouraud Dextrose Agar", "Chromogenic Candida Agar", "Blood Agar" ], "Colony Morphology": [ "Cream", "Smooth", "Butyrous" ], "Oxygen Requirement": "Facultative Anaerobe", "Growth Temperature": "25//42", "Catalase": "Positive", "Oxidase": "Negative", "Indole": "Negative", "Urease": "Negative", "Citrate": "Negative", "Methyl Red": "Negative", "VP": "Negative", "H2S": "Negative", "DNase": "Negative", "ONPG": "Negative", "Coagulase": "Negative", "Gelatin Hydrolysis": "Negative", "Esculin Hydrolysis": "Negative", "Nitrate Reduction": "Negative", "NaCl Tolerant (>=6%)": "Variable", "Lipase Test": "Variable", "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": "Variable", "Sorbitol Fermentation": "Variable", "Xylose Fermentation": "Variable", "Rhamnose Fermentation": "Negative", "Arabinose Fermentation": "Variable", "Raffinose Fermentation": "Variable", "Trehalose Fermentation": "Variable", "Inositol Fermentation": "Negative", "Gas Production": "Negative", "TSI Pattern": "Unknown", "Colony Pattern": "Unknown", "Pigment": "None", "Motility Type": "None" }, "field_notes": { "Gram Stain": "Yeast cells often stain Gram-positive but may appear variable.", "Shape": "Oval budding yeast; some species form pseudohyphae or true hyphae.", "Sugar Fermentation": "Patterns are species-dependent and critical for differentiation." }, "key_differentiators": [ { "field": "Germ Tube Test", "expected": "Positive", "distinguishes_from": ["Candida glabrata", "Candida tropicalis"], "notes": "Rapid screening test for Candida albicans." }, { "field": "Chromogenic Agar", "expected": "Species-specific colony colour", "distinguishes_from": ["Non-Candida yeasts"], "notes": "Useful for presumptive species identification." } ], "common_confusions": [ { "genus": "Cryptococcus", "reason": "Both are yeasts, but Cryptococcus is urease-positive and encapsulated." }, { "genus": "Saccharomyces", "reason": "May appear similar on routine culture without speciation." } ], "when_to_question_identification": [ "Urease positivity suggests Cryptococcus.", "Encapsulated yeast with narrow budding argues against Candida.", "Poor growth on Sabouraud Agar is atypical." ], "recommended_next_tests": [ { "test": "Germ tube test", "reason": "Rapid differentiation of Candida albicans.", "api_kit": "API Candida" }, { "test": "Chromogenic Candida Agar", "reason": "Presumptive species identification by colony colour." }, { "test": "MALDI-TOF MS", "reason": "Gold standard for Candida species identification." } ], "supported_species": [ "albicans", "glabrata", "tropicalis" ] }