Risk factors for ESBL-positive Escherichia coli urinary tract infections

Abstract

Objective: to determine the association of prior antibiotic use, prior hospitalizations, prior urinary tract infections, age, sex and comorbidities in adult patients hospitalized with urinary tract infections caused by extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli.

Materials and methods: a case-control study carried out in the hospital setting of private clinics in Lima. Thirty cases and 30 controls were included, with cases defined as hospitalized patients with an ESBL-producing E. coli urinary tract infection diagnosed by urine culture, and controls defined as hospitalized patients without ESBL-producing E. coli infection. Data were taken from incident cases. A bivariate analysis was performed followed by multivariate logistic regression using the significant variables from the bivariate analysis.

Results: the associated factors were: prior antibiotic use OR: 261 (22.5-11,017.4), prior hospitalization OR: 4.6 (1.39-16.1), and prior urinary tract infection OR: 36 (6.9-227.2). After adjusting for potential confounding factors using logistic regression, the main statistically significant associated factor was prior antibiotic use, OR: 97.7 (8.4-1,128.3, p<0.000).

Conclusion: evidence was found that prior antibiotic use is a risk factor significantly associated with ESBL E. coli urinary tract infections.