Risk factors for hospital-acquired urinary tract infection: a case-control study.

The objective is to assess risk factors and microbiological aspects of hospital-acquired urinary tract infection (HAUTI) on six wards of a general regional hospital in Serbia. A case-control study was nested within prospective cohort HAUTIs study conducted from January 1 to December 31, 2007. Three controls were identified for each patient with HAUTI, being chronologically the next three patients surveyed who did not develop HAUTI. The patients and controls were matched by sex and age (±5 years). Assessment of 8,467 patients during the study period revealed HAUTI in 125 (116 symptomatic and 9 asymptomatic). The overall incidence rate of HAUTI was 14.8 cases/1,000 admissions. The mean age (range) of cases and controls was 64.9 (18-85) and 65.2 (17-86), respectively. Multivariate logistic regression analysis showed that duration of catheterization >5 days (OR = 51.91; 95% CI = 23.46-114.82) and the ASA score (OR = 13.42; 95% CI = 2.14-84.30) were independently associated with increased risk of HAUTIs. The most frequently isolated Gram-negative bacteria were Enterobacter, Klebsiella sp., Proteus mirabilis and Escherichia coli. Enterococcus sp. was the most frequent Gram-positive bacteria.