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Dermatophytosis is still being considered as one of the major public health problems in many parts of the world. To identify the prevalence and etiological agents of dermatophytoses, a study was carried out between 2004 and 2006. Out of 1023 subjects suspected to have cutaneous mycoses, 348 (34%) patients were affected with dermatophytoses. The causative agents were identified macroscopically and microscopically after the clinical samples were subjected to potassium hydroxide examination and culture isolation. Epidermophyton floccosum was the most frequently isolated species representing 32.8% of isolates, followed by T. rubrum (18.1%), T. verrucosum (17.2%), T. mentagrophytes var. interdigitale (15.8%), T. mentagrophytes var. mentagrophytes (6.6%) and T. violaceum, T. schoenleinii and Microsporum canis (0.9%). The most common type of infection was tinea cruris (31.9%) affecting in particular male patients. Some other most prevalent tinea types were tinea corporis (20.7%), tinea pedis (19%), and tinea unguium (11.2%). To the best of our knowledge, this is the first report on dermatophytoses in Qazvin and the first study that shows tinea cruris as a major type of superficial fungal infection in Iran. The frequency of tinea was higher in males and tinea cruris showed a remarkably increasing tendency and was an important public health issue in Qazvin.