Mould Identification: A Virtual Self Assessment
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Unknown 72 = Trichophyton erinacei
Case History | |
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A zoo keeper presented with an erythematous scaly skin lesion on the wrist. The fungus below was isolated.
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Culture | |
![]() Colonies are white, flat, powdery, sometimes downy to fluffy with a brilliant lemon yellow reverse.
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Microscopy | |
![]() Numerous large clavate microconidia are borne on the sides of hyphae. Macroconidia are smooth-walled, two- to six-celled, clavate, variable in size, and may have terminal appendages. Macroconidia are much shorter than those seen in T. mentagrophytes.
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Comment: T. erinacei is generally distinguished from other varieties of T. mentagrophytes by (a) its microscopic morphology showing numerous large slender clavate microconidia borne on the slides of hyphae and its smooth, thin-walled clavate macroconidia; (b) its brilliant lemon yellow reverse pigment on plain Sabouraud's agar and Lactritmel agar; (c) its lack of reverse pigment on Sabouraud's salt agar; and (d) its negative hydrolysis of urea.
What is your identification?
Trichophyton mentagrophytes
Trichophyton erinacei
Trichophyton quinkeanum
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