A 5-month-old boy is brought to the physician because of a 2-day history of fever and foul-smelling urine. Urinalysis shows WBCs, nitrites, and leukocyte esterase. Antibiotic therapy is initiated. Renal ultrasound shows no abnormalities. Which of the following is the next best step in management?
Completion of antibiotic course and observation
Repeat ultrasound
Retrograde cystourethrogram
Retrograde urethrogram
Voiding cystourethrogram
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