Evaluation of the Prevalence of E. Coli O Serotypes in Paediatric Population With Recurrent Urinary Tract Infection

Inclusion Criteria: * Age between 0 weeks and 17 years * Significant urine culture positive only for E. coli * For infants up to 3 months of age, a confirmed first UTI episode as identified by urine culture obtained by a sterile method (as described above) and positive for E. coli only (no other pathogens) * For children ≥4 months to \< 18 years a confirmed rUTI episode as identified by urine culture obtained by a sterile method (as described above) and positive for E. coli only (no other pathogens) * Collection of urine culture with a sterile method (suprapubic aspiration, bladder catheterization, clean voided urine) * Signed informed consent form (signed by participant's legally authorized representative for participants who have not attained the age of majority) * Signed Assent Form when appropriate, as determined by participant's age and individual site and country standards Exclusion Criteria: * Patients ≥18 years * Children ≥ 4 months of age with a first UTI episode * Absence of microbiological confirmation of UTI * UTI caused by bacteria other than E. coli or polymicrobial culture * Urine collected with a non-sterile method (urinary bag) * UTI episode within 30 days of the end of antibiotic treatment for the previous UTI episode * Second urine positive for E. coli during the same episode * Patients in the active phase of anticancer treatment