 In this prospective observational study between March 2013 and March 2017, children 0 to 18 years with ESBL-E UTI were enrolled in 24 pediatric departments in France. Clinical and biological characteristics, risk factors of infection of E-ESBL, first and second lines of antibiotic therapies were analyzed. The investigators used the Kaplan-Meier method to estimate the time to fever defervescence and hospitalization duration, and Log-rank test to assess equality of survivor functions. The investigators also analyzed the resistance patterns and molecular characterization of ESBL types in the isolates. 