Abstract
Skin scrapings from the lesions on a 10% KOH-calcofluor mount showed thin septate hyphae. On Sabouraud’s dextrose agar with cycloheximide, a powdery, cream-colored colony with brown reverse grew after 7 days of incubation at 30°C. Lactophenol cotton blue preparation of the culture showed thin hyaline septate hyphae with several spiral hyphae and rare smooth, 4- to 6-celled cigar-shaped macroconidia. Abundant spherical microconidia, around 2 μm in diameter, were seen along the hyphae or were arranged in clusters, giving an en grappe appearance. The isolate was urease test positive, grew luxuriantly on bromocresol purple milk solids glucose, producing an alkaline reaction, did not assimilate sorbitol, and grew at 37°C. It was identified as Trichophyton mentagrophytes species complex based on these phenotypic features and internal transcribed spacer (ITS) sequencing (GenBank accession number MW479456). Although sparse macroconidia were present in this isolate, these are often absent in Trichophyton mentagrophytes species. Trichophyton rubrum, the commonest cause of tinea corporis, can be distinguished from it by its red pigment, inability to hydrolyze urea, causing of hair perforation, and ability to assimilate sorbitol and by ITS sequencing (1).
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