data/rag/knowledge_base/Exiguobacterium/genus.json

{
  "schema_version": "1.0",
  "level": "genus",
  "genus": "Exiguobacterium",

  "overview": {
    "short": "Exiguobacterium species are Gram-positive, non-spore-forming rods or short rods, notable for their ability to survive across wide temperature and environmental extremes.",
    "clinical_context": "Primarily environmental organisms; rarely isolated from clinical specimens, usually as contaminants or opportunistic isolates."
  },

  "expected_fields": {
    "Gram Stain": "Positive",
    "Shape": "Short Rods",
    "Motility": "Variable",
    "Capsule": "Unknown",
    "Spore Formation": "Negative",
    "Haemolysis": "Negative",
    "Haemolysis Type": "None",
    "Media Grown On": [
      "Blood Agar",
      "Nutrient Agar"
    ],
    "Colony Morphology": [
      "Small",
      "Smooth",
      "Cream"
    ],
    "Oxygen Requirement": "Facultative Anaerobe",
    "Growth Temperature": "-2//50",
    "Catalase": "Positive",
    "Oxidase": "Variable",
    "Indole": "Negative",
    "Urease": "Negative",
    "Citrate": "Negative",
    "Methyl Red": "Variable",
    "VP": "Variable",
    "H2S": "Negative",
    "DNase": "Negative",
    "ONPG": "Variable",
    "Coagulase": "Negative",
    "Gelatin Hydrolysis": "Variable",
    "Esculin Hydrolysis": "Variable",
    "Nitrate Reduction": "Variable",
    "NaCl Tolerant (>=6%)": "Positive",
    "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": "Positive",
    "Mannitol Fermentation": "Variable",
    "Sorbitol Fermentation": "Negative",
    "Xylose Fermentation": "Variable",
    "Rhamnose Fermentation": "Negative",
    "Arabinose Fermentation": "Variable",
    "Raffinose Fermentation": "Negative",
    "Trehalose Fermentation": "Positive",
    "Inositol Fermentation": "Negative",
    "Gas Production": "Negative",
    "TSI Pattern": "Unknown",
    "Colony Pattern": "Unknown",
    "Pigment": "None",
    "Motility Type": "Variable"
  },

  "field_notes": {
    "Growth Temperature": "Members exhibit extreme psychrotolerance and thermotolerance depending on species.",
    "Motility": "Some species are motile via peritrichous flagella; others are non-motile.",
    "Oxidase": "Results may vary and are not genus-defining."
  },

  "key_differentiators": [
    {
      "field": "Growth Temperature",
      "expected": "-2//50",
      "distinguishes_from": ["Bacillus", "Paenibacillus"],
      "notes": "Broad temperature tolerance without spore formation is characteristic."
    },
    {
      "field": "Spore Formation",
      "expected": "Negative",
      "distinguishes_from": ["Bacillus"],
      "notes": "Lack of endospores helps separate Exiguobacterium from spore-forming Gram-positive rods."
    },
    {
      "field": "NaCl Tolerant (>=6%)",
      "expected": "Positive",
      "distinguishes_from": ["Listeria"],
      "notes": "Salt tolerance supports Exiguobacterium identification."
    }
  ],

  "common_confusions": [
    {
      "genus": "Bacillus",
      "reason": "Shared Gram-positive rod morphology and catalase positivity."
    },
    {
      "genus": "Listeria",
      "reason": "Overlap in motility and growth on blood agar."
    }
  ],

  "when_to_question_identification": [
    "Spore formation argues against Exiguobacterium.",
    "Strict anaerobic growth excludes Exiguobacterium.",
    "Catalase negativity is inconsistent with the genus."
  ],

  "recommended_next_tests": [
    {
      "test": "Motility testing",
      "reason": "Helps refine species-level differentiation.",
      "api_kit": "API Coryne"
    },
    {
      "test": "Carbohydrate fermentation profiling",
      "reason": "Useful for separating closely related species.",
      "api_kit": "API 50 CH"
    },
    {
      "test": "MALDI-TOF MS",
      "reason": "Reliable confirmation due to biochemical variability.",
      "api_kit": "Not applicable"
    }
  ],

  "supported_species": [
    "acetylicum",
    "antarcticum"
  ]
}