70 cases of bacteremia caused by Staphylococcus Aureus were studied. 49 (70%) males, and 21 (30%) females; 45 (64.5%) cases being nosocomial and 25 (35.4%) community acquired. The complications were significantly associated to the community acquired bacteremia (p less than 0.001), endocarditis and cutaneous abscesses being the most frequent (4). The group of cases with rapidly lethal prognosis was significantly associated to an increase of mortality (p less than 0.001), while lethal and non-lethal groups showed a decrease in mortality (p less than 0.001). We did not find a statistically significant association between nosocomial and community acquired bacteremias nor between antibiotic therapy and the mortality rate, chi 2 = 1.747.303 (N.S.), chi 2 = 1.323.806 (N.S.).