Hello,It sounds like the doctor thinks your son has a
Urinary tract infection. Usually this is treated with a single antibiotic, either
ZIFI or Oflamac that you mentioned would be OK. Usually symptoms go away in 1-3 days with treatment. If he has a
fever, it might take longer. However, usually an infection is not diagnosed based only on the number of White Blood cells (pus cells) in the urine. On the same test, there is also a measure called "leukocytes" and one called 'nitrites'. If these are positive the test is about 80% true that he has an infection.
Also, the urine should be sent for a culture - meaning a test of growth - for the actual germ. In adults, this is often not done, but for children it should be. If it is the most common germ -
E.Coli - that is reassuring that this is just a minor easily treated infection. But if the germ is unusual, or not very sensitive to the antibiotics you've already started, then more evaluation would be needed. Also, if you son's symptoms don't resolve quickly and easily, more evaluation would be needed.
Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Lisa Baker, Pediatrician