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"schema_version": "1.0",
"level": "genus",
"genus": "Erysipelothrix",
"overview": {
"short": "Erysipelothrix species are Gram-positive, facultatively anaerobic, non-spore-forming short rods commonly associated with zoonotic exposure.",
"clinical_context": "Most notably associated with erysipeloid infections following occupational exposure to animals, fish, or animal products."
},
"expected_fields": {
"Gram Stain": "Positive",
"Shape": "Short Rods",
"Motility": "Negative",
"Capsule": "Negative",
"Spore Formation": "Negative",
"Haemolysis": "Variable",
"Haemolysis Type": "Variable",
"Media Grown On": [
"Blood Agar"
],
"Colony Morphology": [
"Small",
"Grey",
"Translucent",
"Smooth"
],
"Oxygen Requirement": "Facultative Anaerobe",
"Growth Temperature": "20//42",
"Catalase": "Negative",
"Oxidase": "Negative",
"Indole": "Negative",
"Urease": "Negative",
"Citrate": "Negative",
"Methyl Red": "Positive",
"VP": "Negative",
"H2S": "Positive",
"DNase": "Negative",
"ONPG": "Negative",
"Coagulase": "Negative",
"Gelatin Hydrolysis": "Negative",
"Esculin Hydrolysis": "Negative",
"Nitrate Reduction": "Negative",
"NaCl Tolerant (>=6%)": "Negative",
"Lipase Test": "Negative",
"Lysine Decarboxylase": "Negative",
"Ornithine Decarboxylase": "Negative",
"Ornitihine Decarboxylase": "Negative",
"Arginine dihydrolase": "Negative",
"Glucose Fermentation": "Positive",
"Lactose Fermentation": "Negative",
"Sucrose Fermentation": "Variable",
"Maltose Fermentation": "Negative",
"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"
},
"field_notes": {
"H2S": "Distinctive H2S production on TSI or iron-containing media helps differentiate Erysipelothrix from other Gram-positive rods.",
"Catalase": "Catalase-negative, distinguishing it from many Gram-positive rods.",
"Haemolysis": "May be weak or variable; not a reliable primary discriminator."
},
"key_differentiators": [
{
"field": "H2S",
"expected": "Positive",
"distinguishes_from": ["Listeria", "Corynebacterium"],
"notes": "Rare H2S production among Gram-positive rods."
},
{
"field": "Catalase",
"expected": "Negative",
"distinguishes_from": ["Listeria"],
"notes": "Separates Erysipelothrix from catalase-positive short rods."
}
],
"common_confusions": [
{
"genus": "Listeria",
"reason": "Shared short rod morphology and facultative anaerobic growth."
},
{
"genus": "Corynebacterium",
"reason": "Gram-positive rod morphology with skin-associated isolates."
}
],
"when_to_question_identification": [
"Catalase positivity argues against Erysipelothrix.",
"Motility suggests Listeria.",
"Absence of H2S production should prompt reconsideration."
],
"recommended_next_tests": [
{
"test": "H2S detection on TSI or iron-containing media",
"reason": "Key genus-level discriminator.",
"api_kit": "API Coryne"
},
{
"test": "Motility testing",
"reason": "Non-motility helps exclude Listeria.",
"api_kit": "Manual wet mount"
},
{
"test": "MALDI-TOF MS",
"reason": "Definitive identification and species-level resolution.",
"api_kit": "Not applicable"
}
],
"supported_species": [
"rhusiopathiae",
"tonsillarum"
]
} |