We studied 210 episodes of infective endocarditis in 204 patients. The prevalence of this disease in our series ranged from 0.32 to 1.30 (mean, 0.75) episodes per 1000 admissions per year. There were 115 male and 89 female patients, whose ages ranged from newborn to 91 years (median, 60-70). One-hundred-and-forty-eight episodes involved host valves and another 33 episodes occurred in intravenous drug users. There were 2 episodes of early and 27 episodes of late prosthetic valve endocarditis. Staphylococcus aureus accounted for 99 episodes (47.1%), alpha-hemolytic streptococci for 29 episodes (13.8%), enterococci for 11 episodes (5.2%), culture-negative endocarditis for 11 episodes (5.2%), and other organisms for 60 episodes (28.6%). Severe back pain was the chief complaint in 15 patients. 2-D echocardiography was performed in 164 episodes, results in 67 (40.9%) of which were positive. Valve surgery was performed in 29 episodes (23 host valves and 6 prosthetic valves). The overall mortality was 21.4%. Autopsy was performed in 22 of the 45 patients who died (48.9%). The mortality rate increased with age, (10.1% and 31.5% for patients < 60 years old and 60 years or older, respectively (p < 0.001).