E. coli is a common pathogenic bacterium, and E. coli infection can cause diseases of several systems. Most commonly, it causes digestive system diseases, such as acute gastroenteritis and chronic enteritis. E. coli infection of the intestine often results in fever, nausea, vomiting, discomfort in the stomach area, abdominal pain, bloating, diarrhea and other intestinal dysfunction and indigestion. In addition, E. coli can cause urinary system infections, such as urethritis, cystitis, pyelonephritis and other diseases, as well as cholecystitis, appendicitis, peritonitis and other diseases. E. coli infection in women can cause gynecological inflammation, such as pelvic inflammatory disease, adnexitis, endometritis, etc. In addition, children or elderly people with poor health, as well as traumatic skin wounds, if infected by E. coli, may cause very serious diseases such as bacteraemia and sepsis.