Bacterial infection refers to the invasion of bacteria into the blood circulation for reproduction, producing certain toxins and metabolites. Bacterial infection can be seen in a variety of diseases such as systemic infection, intestinal bacterial infection, bacterial urinary tract infection, etc., as follows: 1. Systemic infectious disease: the main manifestations are sudden chills, high fever, headache, vomiting, rapid heart rate, shortness of breath or difficulty, jaundice or subcutaneous bleeding petechiae in severe cases. Treatment is mainly comprehensive, including treatment of the primary foci of infection, killing pathogenic bacteria and systemic supportive therapy; 2, intestinal bacterial infections: such as gastritis, electrolyte disorders, shock, etc., mainly manifested as diarrhea, stool nature of dilute watery or with pus and blood, in serious cases can lead to electrolyte disorders, shock, the general application of antibiotic drug therapy; 3, bacterial urinary tract infections: common cystitis, urethritis The main manifestations are frequent urination, urgent urination, painful urination and pain in the lower abdomen, etc. It is necessary to identify the causative organism and select antibiotics for targeted treatment, commonly used drugs are penicillin and cephalosporins. In addition, you can also prevent bacterial infections on a daily basis by ensuring the cleanliness of the skin, paying attention to avoid trauma, and if you have a wound, it is recommended to disinfect it or use antibiotics or immunosuppressive drugs under the guidance of a doctor, which can effectively prevent infection.