According to the Law of the People’s Republic of China on the Prevention and Control of Infectious Diseases, statutory infectious diseases are divided into three categories of infectious diseases: A, B and C. Category A infectious diseases include plague and cholera, which are virulent infectious diseases under compulsory management. 2. Category B infectious diseases mainly include infectious atypical pneumonia, AIDS, viral hepatitis, poliomyelitis, human highly pathogenic avian influenza, measles, epidemic hemorrhagic fever, rabies In 2009, influenza A (H1N1) was added. In order to strictly manage infectious diseases, towns require direct network reporting within 6 hours after the issuance of Class B infectious diseases, and rural areas cannot exceed 12 hours.