<s>[INST] I had a kidney infection a few weeks ago. It was e coli 40,000 colony. I started to have the same symptoms again and they did another UA and it says 40,000 neg baccili but this doctor said it was normal so they did not treat it. What is the diffiference between the two types of infection. 52 female [/INST] Minimum bacteria is normal , in ecoli case it is not bacilli, these are 40,000 colonies, one colony means it contains more yhan 1 lakh bacteria..U should worry if number of bacteria mor e than 3 lakhs </s>