myone year old boy baby had UTI last month.he was on IV antibiotics later within a week had fever and started with oral antibiotics for  week.and this week we have done urine culture and routine shows no pus cells but heavy growth of E.coli..what are the possible cause?
Let me ascertain that E.cold is a normal inhabitant of our body. It is present in the intestines and even urinary tract of ALL of us. So I would not really be surprised if E.cold is detected. It is only when their count crosses 10^5 or 10,00,000 per ml of urine, that we call it urinary tract infection or UTI. If the count is actually lesser and if there is no pus cells, it does not denote an infection. Presence of pus cells indicates that the body is fighting them. Absence would indicate that the body is fine with the presence of the E.cold. In case of colony count greater than 10^5, treatment with antibiotics like ofloxacin for 7-14 days is needed.