Memorias del Instituto de Investigaciones en Ciencias de la Salud
versão On-line ISSN 1812-9528
SANABRIA, R et al. Mycosis produced by dermatophytes and yeasts. Mem. Inst. Investig. Cienc. Salud [online]. 2002, vol.1, n.1, pp.63-68. ISSN 1812-9528.
Tropical regions offer the climate and natural conditions suitable for the growth and proliferation of fungi causing superficial dermatomycosis. The purpose of this study was to determine the prevalence of dermatophytes and yeast producing superficial mycosis in patients (0-75 years old) with dermatomycosis clinical signs, referred to the Microbiology department (IICS) from January 1997 to June 2001. Biological samples were extracted from the lesions by scraping or scalping and then analyzed under direct microscopy (400X) with KOH and cultured in Petri plates by using Sabouraud with chloranfenicol agar, Biggy agar and mycobiotic aga. All plates were incubated for 3 weeks at 28°C for fungi isolation and identification was carried out through micro and macro morphological characteristics of colonies. Out of 640 patients with clinical signs of dermatomycosis referred to the laboratory, 303 yielded positive results for fungi by direct and culture examinations. Forty five percent of the positive samples corresponded to children (0-15 years old) and 55% to adults. Fifty nine percent corresponded to women and 41% to men. In the 136 children, tinea capitis was the most comon body lesion as 74% presented that lesion followed by a 21% presenting skin lesions and 5% with nail lesions. In the children, the frequencies of etiologic agents were as follows: Microsporum canis in 38%, Trichophyton mentagrophytes in 32%, Trichophyton rubrum in 17%, Candida sp in 7%, Microsporum gypseum in 4.5% and Malassezia furfur in 1.5%. In the 167 adult patients, tinea capitis was not registered and the most common body lesion was skin lesion presented by 61% followed by nails lesions presented by 39%. The frequencies of isolated species were as follows: Candida sp in 44.9 %, T. Rubrum in 27.5%,T. mentagrophytesin 12.6%, M. Furfur in 9%, Trichophyton sp in 5% , M. canis in 0.6% and M. gypseum in 0.6%. Epidermophyton genus, frequently reported in Europe, was not isolated in this study.
Palavras-chave : Dermatophytes; yeasts; superficial dermatomycosis.