A 4 months old infant with UTI was treated for 14 days with IV cefotaxime. What is the next step in management?

a. USG only(Ref: Nelson 20/e 2560-2561, EUA guidelines 2014)AAP recommends that in a typical first-episode of UTI, initial imaging should be ultrasonography of the kidneys, ureters, and bladder.VCUG is indicated if the ultrasound study is abnormal, the patient has atypical features, or after a recurrent febrile UTI.As per EUA (European Association of Urology), Renal and bladder USG is advised in all children with febrile UTI to exclude dilatation or anomalies of the upper & lower urinary tract, if no improvement is seen within 24 h