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Mould Identification: A Virtual Self Assessment

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Unknown 24 = Trichophyton mentagrophytes

Case History
A 11 year old boy presented with an erythematous pustular lesion on the chest. Skin scrapings taken showed the presence of fungal elements and the fungus shown below was isolated.
Direct Microscopy (KOH mount)

KOH mount of infected skin scales showing typical dermatophyte hyphae breaking up into arthroconidia.
Culture

On Sabouraud's dextrose agar, colonies are generally flat, white to cream in colour, with a powdery to granular surface. Some cultures show central folding or develop raised central tufts or pleomorphic suede-like to downy areas. Reverse pigmentation is usually a yellow-brown to reddish-brown colour.
Microscopy

Microconidia and macroconidia of T. mentagrophytes.

Microconidia of T. mentagrophytes.

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Spiral hyphae of T. mentagrophytes.
Comment: T. mentagrophytes is the zoophilic dermatophyte with a world-wide distribution and a wide range of animal hosts including mice, guinea-pigs, kangaroos, cats, horses, sheep and rabbits. Produces inflammatory skin or scalp lesions in humans, particularly in rural workers. Kerion of the scalp and beard may occur. Invaded hairs show an ectothrix infection but do not fluoresce under Wood's ultra-violet light.

About Trichophyton Back to Virtual Assessment

What is your identification?

Trichophyton tonsurans
Trichophyton interdigitale
Trichophyton mentagrophytes

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Dr David Ellis
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