Gaps and inconsistencies in published information about optimal antibiotic treatment duration for uncomplicated urinary tract infection (UTI) in pediatric patients pose a dilemma for antibiotic stewardship. Evaluate the association of antibiotic treatment duration with recurrence rates in children with new-onset cystitis or pyelonephritis. Retrospective cohort analysis of patients aged 2 to 17 years with new-onset cystitis or pyelonephritis and without renal/anatomical abnormality was conducted using Truven Health MarketScan Database for 2013-2015. Of 7698 patients, 85.5% had cystitis, 14.3% pyelonephritis. Duration of antibiotic treatment was as follows: 3 to 5 days for cystitis (20.4%) or 7 (33.6%), 10 (44.2%), or 14 (1.8%) days for any UTI. Recurrence occurred in 5.5% of patients. Covariates associated with increased recurrence risk included pretreatment antibiotic exposure (odds ratio [OR] = 1.29; 95% CI = 1.06-1.57), pyelonephritis on diagnosis date (OR = 1.44; 95% CI = 1.03-2.00), follow-up visit during antibiotic treatment (OR = 3.21; 95% CI = 2.20-4.68), parenteral antibiotic (OR = 1.89; 95% CI = 1.33-2.69), and interaction of pyelonephritis diagnosis with nitrofurantoin monotherapy (OR = 3.68; 95% CI = 1.20-11.29). After adjustment for covariates, the association between duration of antibiotic treatment and recurrence was not significant (compared with 7 days: 10 days: OR = 1.07, 95% CI = 0.85-1.33; 14 days: OR = 0.89, 95% CI = 0.45-1.78). Antibiotic treatment duration was not significantly associated with recurrence of uncomplicated UTI in a national pediatric cohort. Results provide support for shorter-course treatment, consistent with antimicrobial stewardship efforts.

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