Multiple colonies of Trichophyton rubrum were isolated from single skin specimens from 10 patients with tinea pedis and were typed using a PCR-based analysis of repeats in the rRNA intergenic spacer. In each case only a single strain type of T. rubrum was isolated, suggesting a monotypic aetiology of tinea pedis. This is in contrast to the multiple strains previously shown to be involved in many cases of onychomycosis.
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