Comparison of the antibiotic usage during the last 90 days prior to inclusion in the study population with and without ESBL positive urinary tract infection.

aNumber of subjects who had used at least one dose in the past 90 days.bSix cases and 17 controls received an antimicrobial agent at the day before the urinary sample only.cPenicillin, amoxicillin, cloxacillin or cephalexin (some patients used more than one type).