Trichophyton mentagrophytes

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Trichophyton mentagrophytes var. granulosum

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Blanchard, 1896

General definition
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Zoophilic dermatophyte.

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Distributed worldwide, with a focus on North America and Europe. Different animal reservoirs: guinea pigs, rabbits, hamsters. The proportion of variations common in Central Europe is estimated at 10-20% of all dermatophytes.

Clinical picture
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S.u. Tinea pedum, tinea unguium, tinea corporis, tinea capitis profunda, tinea capitis superficialis, tinea barbae, tinea manuum. Mostly creeping infestation of the interdigital spaces of the feet. In chronic cases, it often affects the toenails and hairless skin. Fingernails, head hair or beard hair are less frequently affected.

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  • Strongly branched hyphae (2-6 septa).
  • Spiral hyphae: Very numerous, often found only in the highly pigmented or granular cultures. In the absence of these, the culture can only be identified macroscopically by its growth form.
  • Microconidia: Arranged in an acladian or botrytis shape, round (2-5 μm Ø) or pear-shaped (length: 3-4 μm; width: 2-3 μm), usually laterally attached to 1st and 2nd degree mycelium branches.
  • Macroconidia: If present mostly cylindrical, cigar-shaped or compressed, thin- and smooth-walled, 3-8 chambers, length: 10-50 μm; width: 5-10 μm.
  • Rarely chlamydospores, rocket hyphae or nodular organs.

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  1. Aste N et al (2003) Tinea pedis observed in Cagliari, Italy, between 1996 and 2000 Mycoses 46: 38-41
  2. Boralevi F et al (2003) Lupus erythematosus-like eruption induced by TRICHOPHYTON MENTAGROPHYTES infection. Dermatology 206: 303-306
  3. Salim A, Young E (2002) Erythema multiforme associated with Trichophyton mentagrophytes infection. J Eur Acad Dermatol Venereol 16: 645-646


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Last updated on: 29.10.2020