<prompt> Which of the following investigation is not needed during evaluation following 1st episode of urinary tract infection on a 7 month old boy?DMSA scanUltrasound of kidney and urinary tractDTPA scanMicturating cystourethogram MCU  <response>: Evaluation following the first episode of urinary tract infection: Age 1 yr -- USG, MCU, DMSA scan Age 1-5 yr -- USG, DMSA scan if USG or DMSA scan is abnormal -- MCU Age 5 yr -- USG if USG abnormal -- MCU DMSA scan 