According to China’s “Prevention and Control of Infectious Diseases Law”, infectious diseases are mainly divided into three categories: A, B and C. As of 2021, there are 40 types of statutory infectious diseases. 1. Category A infectious diseases: belong to those that require mandatory management and require strict control, isolation and treatment of patients, carriers, suspected infections and close contacts, as well as epidemic areas. The main infectious diseases in this category are plague and cholera; 2. Category B infectious diseases: require strict control and management, timely control, isolation and treatment. The main infectious diseases in this category are infectious atypical pneumonia, AIDS, viral hepatitis, poliomyelitis, human highly pathogenic avian influenza, measles, epidemic hemorrhagic fever, rabies, epidemic B encephalitis, dengue fever, anthrax, bacterial and amoebic dysentery, tuberculosis, typhoid and paratyphoid fever, epidemic cerebrospinal meningitis, pertussis, diphtheria, neonatal tetanus, scarlet fever, brucellosis, gonorrhea The main infectious diseases include rubella, leprosy, leptospirosis, schistosomiasis, malaria, human H7N9 avian influenza, new coronavirus pneumonia; 3. Category C infectious diseases: mainly for surveillance and management, including rubella, leprosy, acute hemorrhagic conjunctivitis, influenza, mumps, typhus, black fever, encephalitis, filariasis, other infectious diarrheal diseases, hand, foot and mouth disease. However, the management approach for some category B infectious diseases needs to follow category A, such as atypical pneumonia, pulmonary anthrax, and the new coronavirus pneumonia outbreak that began in late 2019.