Indole test (+) bacteria are mainly considered to be caused by Escherichia coli, E. coli is normally present in the body, usually does not lead to human disease, the body has a decline in immunity or intestinal flora imbalance may cause E. coli overpopulation or extra-intestinal infections, such as common clinical cystitis, urethritis, cholecystitis and so on. Infection symptoms caused by E. coli, in the clinical treatment of the main use of broad-spectrum antibiotics to be antibacterial treatment, commonly used cephalosporins, quinolones.