INterest of the Negative Predictive Value of Integrons in Choosing a Narrow-spectrum Empirical anTibiotic Treatment vs Usual Empirical Antibiotic Treatment for Urinary Tract infectionS in the PEDiatric Emergency Department

Inclusion Criteria: * Children above 3 months old and under 18 years old * Consultation in a participating pediatric emergency department * Suspicion of UTI with fever (Fever ≥ 38°C and urine dipstick test positive for leukocytes and/or nitrites) * First episode of UTI with fever * Written informed consent of the holders of parental authority * Affiliated to Social Security Exclusion Criteria: * Criteria of severity: * Severe infection with severe sepsis or septic shock * Dehydration ≥ 10% * Fever ≥ 38°C \> 4 days (96h) * Indication of surgical or interventional drainage * Complication risk factors: * Any anatomic or functional defect of the urinary tract (other than low-grade VUR and calyceal dilation \< 10 mm) * Repetition of UTI with fever ≤ than 6 months since the previous episode * Repetition of UTI with fever and anatomic or functional defect of the urinary tract * Pregnancy * Severely immunocompromised patient * Severe chronic renal failure defined as a clearance \< 30 mL/min/1.73 m2 * Severe liver failure * 3GC allergy * Contra-indication to SXT: * G6PD deficiency * Treatment with methotrexate * Allergy to sulfonamide * Antibiotic treatment within 48h before admission * Empirical antibiotic treatment not recommended