Your child has received what most people across the world would accept as standard treatment. Antibiotics are usually given for 6 to 12 weeks post-operation. Sometimes children continue to get urinary infections afterwards but just the presence of pus cells in the urine must not be inferred as urinary infection. It is very important to collect the urine sample properly and have it evaluated at a good lab as this test is prone to a lot of errors. I would not be very concerned if there was no fever associated at the time of this sampling. It is good to have a post-operative evaluation. I would advise an ultrasound at 6 months and 1 year post-operation. If there are any concerns then the nuclear scans may be repeated.