<prompt> The most common underlying anomaly in a child with recurrent urinary tract infection is:Posterior urethral valvesVesicoureteric refluxNeurogenic bladderRenal calculi  <response>: 30-35 children with UTI have VUR Recurrent UTI are observed in 30-50 children, usually within 3 months of the first episode. Predisposing factors for recurrent UTI include female sex, age below 6 months, obstructive uropathy, severe vesicoureteric reflux VUR, habitual postponement of voiding voiding dysfunction, constipation and repeated catheterization, e.g. for neurogenic bladder. 