Urine samples from patients with clinical antecedents of suspicion genitourinary pathology were studied for bacteria, fungi and for the presence of microsporidia. Usual culture media and methods were used lo study bacteria and fungi organisms. To study for microsporidian parasites, nine ml were centrifuged and smears of the sediment were fixed, previous tratment with 5% KOH and then stained according to a modified Weber method. Groups of Microsporidia spores were foud in twenty five per cent of the samples, coming more frenquently from people between 26 to 55 five years old .