ABSTRACT
The incidence of nosocomial urinary tract infections (UTI) in the medical services of Santo Tomás Hospital from 1980 to 1985 was 56% in Neurology Section, 73% in cardiology and 74% in nephrology. These percentages declined, with epidemiological surveillance, to 21%, 31% and 53% respectively, for the period between 1986 and 1990. In the surgical services the incidence of nosocomial UTI was 85% in urology and 15% in general surgery, from 1980 to 1985. The incidence remained unchanged in urology (81%) and general surgery (17%) despite epidemiological surveillance, but decreased in neurosurgery (from 55% to 37%) for the period between 1986 and 1990. Between 1985 and 1990, Staphyloccocus aureus was the most frequently isolated bacterium from surgical wounds (34%) and from patients with intravenous catheters (23%). Pseudomonas aeruginosa was the most frequently isolated bacterium in nosocomial UTI (26%) and respiratory tract infections (45%) and in patients with nosocomial septicemia, it was a species of Klebsiella