<s>[INST] My daughter is 3 and has just been released from hospital  having been treated for a kidney infection. Cultures taken showed it was due to e coli and that ous levels were 20 plus. Is this a high level of infection for a three yr old at 20 plus pus? Is this why she was so ill and fevered? [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Ecoli is the commonest cause for urinary tract infection. Nothing much to worry as it will respond well with antibiotics. 20 pus cells is not that much high and the severity of the illness will not depend on number of pus cells. You can start antibiotics based on culture reports. Take paracetamol syrup for pain. Drink plenty of water to keep her hydrated. Hope I have answered your query. Let me know if I can assist you further. </s>