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Escherichia coli is a frequent causative agent of urinary tract infections, and increasing resistance of E. coli to antimicrobials presents a growing challenge.Here we compare phenotypes of extended-spectrum β-lactamase (ESBL) producers (n = 220) with a control group of sensitive strains (non-ESBL producers; n = 150). For each strain, we assessed the presence of O25 antigen, hemolysis, biofilm production,...