RESUMO
Onychomycosis epidemiology is a combination of various factors which include, among others, clinical presentation, etiologic agents of the infection and the patient's history background. Out of a total of 672 nail samples examined, 460 (68.4) were microscopy positive for fungi and 306 (66.5) of these were culture positive, including Candida (82), dermatophytes (13.4), Trichosporon spp (3.6) and nondermatophyte molds (1). Onychomycosis was more frequent in females (79.7) than in males (20.3). These were more common in fingernails (96.1) than in toenails (60) and yeasts were the most isolated etiologic agents. Among the clinical presentations, paronychia (CP) (57.2) and onycholysis (CO) (24.8) were the most common, caused frequently by C. albicans in 52.6 and 60.5 of the cases, respectively. T. rubrum (44.4) and Trichosporon spp (22.2) were the most frequent species in the case of distal lateral subungual onychomycosis (DLSO). Fusarium spp was the agent responsible for 33.3 of the cases of proximal subungual onychomycosis (PSO) and for 14.3 of white superficial onychomycosis (WSO), whereas Acremonium spp was responsible for 14.3 of the cases of WSO.