[Extra-digestive reservoir of extended-spectrum beta-lactamase producing Enterobacteriaceae in non-infected patients: a study based on the systematic searching in urine and other clinical samples].

Our objective was to assess the extra-digestive reservoir of extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBLE) by identifying them in clinical samples in which growing bacteria are not systematically analysed (bacterial identification and antimicrobial susceptibility testing) in routine practice. During a 5-week period, an analysis was systematically performed for Enterobacteriaceae colonies isolated in certain clinical samples (urine samples, respiratory-tract samples, and a group of samples called "miscellaneous samples") according to our study protocol. Samples in which an antimicrobial susceptibility testing was performed for bacteria isolated according to our routine practice were considered infected.