RESUMO
A descriptive and retrospective study was conducted aimed at knowing the behavior and the frequency of the bacterial isolations most frequently found in different biological samples (sputum, blood and urine) from patients with HIV/AIDS diagnosis that were seen at the Outpatient Department or that were admitted at the Hospital of "Pedro Kouri" Institute of Tropical Medicine from 1997 to 2001. It was observed that most of the isolations were obtained from sputum samples and that Pseudomonas aeuroginosa was the most isolated microorganism in all samples. Pseudomonas aeuroginosa proved to be the most isolated microorganism in sputum with 28.5%. The bacteria most commonly isolated in blood was Staphylococcus epidermidis with 48.5%. The uropathogenic microorganism most found in urine was Escherichia coli with 43.5%.