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Trichophyton interdigital

Author:Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Synonym(s)

Kaufmann-Wolff mushroom; Merchant Wolf Mushroom; Trichophyton mentagrophytes var. interdigital

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HistoryThis section has been translated automatically.

Blanchard, 1896; Priestley, 1917

DefinitionThis section has been translated automatically.

Primary downy variant of Trichophyton mentagrophytes. Anthropophilic dermatophyte.

Occurrence/EpidemiologyThis section has been translated automatically.

Distributed worldwide, with a focus on North America and Europe.

Clinical pictureThis section has been translated automatically.

S.u. Tinea pedum, tinea unguium, tinea inguinalis. Mostly creeping infestation of the interdigital spaces of the feet or the genitocrural region. In chronic cases, it often spreads to the toenails or hairless skin. Fingernails, head hair or beard hair are rarely affected. In women, occasionally picture of the tinea granulomatosa follicularis et nodularis cruris.

MicroscopyThis section has been translated automatically.

  • Strongly branched hyphae.
  • Spiral Hyphae: Numerous, typical, especially in older cultures. In the absence of these, the culture can only be identified macroscopically by its growth form.
  • Microconidia: Round (2-5 μm Ø) or pear-shaped (length: 3-4 μm; width: 2-3 μm), acladium or botrytis, usually standing laterally on 1st and 2nd degree mycelium branches.
  • Macroconidia: May be absent, if present mostly cylindrical or swaged, thin- and smooth-walled, 3-8 chambers, length: 10-50 μm; width: 5-10 μm.

DiagnosisThis section has been translated automatically.

For the reliable differentiation of Trichophyton rubrum and Trichophyton interdigitale, special culture media (e.g. potato glucose agar or urea agar) may additionally be required for the detection of urea cleavage of Trichophyton interdigitale.

LiteratureThis section has been translated automatically.

  1. Perea S et al (2000) Prevalence and risk factors of tinea unguium and tinea pedis in the general population in Spain. J Clin Microbiol 38: 3226-3230
  2. Seebacher C et al (2007) Onychomycosis. J Dtsch Dermatol Ges 5: 61-66
  3. Trotha R et al (2003) Tinea barbae caused by a zoophilic strain of Trichophyton interdigitale. Mycoses 46: 60-63
  4. Weller R, Delivers C (1996) Transmission of Trichophyton interdigitale via an intermediate plant host. Br J Dermatol 135: 656-657

Authors

Last updated on: 29.10.2020

Author: Prof. Dr. med. Peter Altmeyer