actually my old brother ,39 years old, last two months back he had fever with chills.increased WBC count, & 25-30 pus cells in urine ,so our doctor suspected this as uti & treated him antibiotic tagnum 1gm bid for 5 days, Now agian he has mild fever,increased wbc count (0000),25-30 pus cells in urine.& now only we have done transrectal usg & thats normal. So please tell me the cause, I am working as a clinical perfusionist in cardiac surgery .