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Nondermatophytic moulds as a causative agent of onychomycosis in tehran.

BACKGROUND: In the last few years the number of cases of nondermatophytic onychomycosis has greatly increased.

AIM: To evaluate the incidence, the clinic characteristics, and predisposing factors of nondermatophytic onychomycosis.

MATERIALS AND METHODS: All collected specimens were analyzed by direct microscopy and culture. Microscopic examination of these specimens was carried out in potassium hydroxide solution (20%) with dimethyl sulfoxide (4%). These specimens were cultured on sabouraud's glucose agar with chloramphenicol and sabouraud's glucose agar with chloramphenicol and cycloheximide. Cultures were incubated at 25 degrees C for up to 28 days and checked twice weekly for growth.

RESULTS: Nondermatophytic onychomycosis were 11.5% of all onychomycosis. We found that Aspergillus spp. were the more responsible etiologic agents of nondermatophytic onychomycosis, resulting in a total of 28 patients (59.6%). In our study other causative agents were Acremonium spp. (17%), Fusarium spp. (12.7%), Geotrichum spp. (4.2%), Trichosporun spp., (4.2%) and Scopulariopsis spp (2.1%). In our patients moulds onychomycosis developed mainly in toenails (74.5%).

CONCLUSION: Knowing the exact pathogen is important and has implications in therapy and prognosis.

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