[Factors associated with extended-spectrum betalactamases-producing organisms among patients with urinary tract infections: a prospective cohort study].

Background: Urinary tract infections (UTIs) caused by extended-spectrum betalactamases (ESBL) are an increasingly common problem.

Aim: To develop an association model to allow an early detection of ESBL-producing microorganisms.

Methods: A prospective observational cohort study was undertaken among patients admitted with a diagnosis of culture-proven UTI to the Internal Medicine Ward of the Hospital Naval Almirante Nef between February and November, 2011.