Hi... Just To Ask You Regarding The Condition Of My

Hi... just to ask you regarding the condition of my brother. His pus cells are not decreasing even after taking antibiotics recommended by his urologist. He has already undergone culture sensitivity test and ultrasound. Then the doctor advise to take antibiotic based on the lab result. What i am wondering is that still his pus cells is not decreasing. What the probable cause? Hoping for your answer... he was scheduled for ct stonogram next week to check his kidney.