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Introducción: La pitiriasis versicolor es una patología frecuente en Paraguay; sin embargo, su epidemiologia es desconocida. Objetivo: Determinar la frecuencia de especies de Malassezia causantes de pitiriasis versicolor y las características epidemiológicas de la población. Materiales y Métodos: Se recolectaron muestras de pacientes con diagnóstico presuntivo de pitiriasis versicolor. El diagnóstico laboratorial se realizó mediante examen en fresco y cultivo en agar Dixon modificado y agar cromogénico Chromagar Malassezia®, incubados a 32ºC y la identificación por las características macro y micromorfológicas, pruebas bioquímicas y fisiológicas. Resultados: Se incluyeron 102 pacientes (51% femenino), de 1 mes a 63 años de edad, siendo el grupo etario predominante el de 11 a 20 años (35,3%). La localización más frecuente fue la espalda (60,8%). Predominaron las formas hipocrómicas (48%). La especie más frecuente fue M. globosa (52,9%), seguida de M. furfur (24,5%), M. sympodialis (18,6%) y M. slooffiae (6,9%). Conclusiones: La epidemiología observada es similar a otros estudios sudamericanos, no hace distinción de sexo, se presenta predominantemente en la forma clínica hipocrómica y M. globosa aparece como principal responsable. Este es el primer reporte sobre las especies causantes de pitiriasis versicolor en Paraguay y las características de la población con esta patología. Background: Pityriasis versicolor is a frequent pathology in Paraguay; however, its epidemiology is unknown.Aim: To determine the frequency of Malassezia species causing pityriasis versicolor and the epidemiological characteristics of the population. Methods: Samples from patients with a presumptive diagnosis of pityriasis versicolorwere collected. Laboratory diagnosis was carried out by fresh examination and culture in modified Dixon agar and chromogenic Chromagar Malassezia®, incubated at 32° C, and identification by macro and micromorphological features, biochemical and physiological tests. Results: 102 patients were included (51% female) from 1 month to 63 years of age, the predominant age group was 11-20 years (35.3%). The most frequent location was on the back (60.8%). Hipocromic clinical forms (48%) predominated. The most frequent species was M. globosa (52.9%),followed by M. furfur (24.5%), M. sympodialis (18.6%) and M. slooffiae (6.9%). Conclusions: The observed epidemiology is similar to other South American studies, with no sex distinction, predominantly hypochromicclinical form and as primary responsible species appears M. globosa. This is the first report on species causing pityriasis versicolor in Paraguay and the characteristics of the affected population. Fil: Fariña González, Norma. Instituto de Investigaciones En Ciencias de la Salud; Paraguay Fil: Acosta, Romina. Hospital Nacional Itaugua; Paraguay Fil: Samudio, Margarita. Instituto de Investigaciones En Ciencias de la Salud; Paraguay Fil: Aldama, Arnaldo. Hospital Nacional Itaugua; Paraguay Fil: Bolla, Lourdes. Hospital de Clínicas Asunción; Paraguay Fil: Figueredo, Ladis. Laboratorio San Roque; Paraguay Fil: Giusiano, Gustavo Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional del Nordeste. Instituto de Medicina Regional; Argentina

Pityriasis versicolor is a frequent pathology in Paraguay; however, its epidemiology is unknown.To determine the frequency of Malassezia species causing pityriasis versicolor and the epidemiological characteristics of the population.Samples from patients with a presumptive diagnosis of pityriasis versicolor were collected. Laboratory diagnosis was carried out by fresh examination and culture in modified Dixon agar and chromogenic Chromagar Malassezia®, incubated at 32° C, and identification by macro and micromorphological features, biochemical and physiological tests.102 patients were included (51% female) from 1 month to 63 years of age, the predominant age group was 11-20 years (35.3%). The most frequent location was on the back (60.8%). Hipocromic clinical forms (48%) predominated. The most frequent species was M. globosa (52.9%), followed by M. furfur (24.5%), M. sympodialis (18.6%) and M. slooffiae (6.9%).The observed epidemiology is similar to other South American studies, with no sex distinction, predominantly hypochromic clinical form and as primary responsible species appears M. globosa. This is the first report on species causing pityriasis versicolor in Paraguay and the characteristics of the affected population.