Category A and B infectious diseases refer to our statutory Category A and Category B infectious diseases. 1. Class A infectious diseases: China’s statutory Class A infectious diseases refer to plague and cholera, which require strict management. In both urban and rural areas, once these infectious diseases are detected, they must be reported to the epidemic prevention station within two hours. There are also some Category B infectious diseases that need to be managed according to Category A, such as novel coronavirus pneumonia, SARS and pulmonary anthrax. 2. Category B infectious diseases: Category B infectious diseases include AIDS, viral hepatitis, rabies, tuberculosis, anthrax, dengue fever, malaria, new coronavirus pneumonia, scarlet fever, etc., which need to be properly prevented and controlled according to relevant regulations. Whether it is a Category A or Category B infectious disease, it will bring some unforeseeable and serious damages to the individual, the society, and even the whole country, so it needs to be taken seriously by everyone. Once there is a suspected disease, it should be controlled and treated as soon as possible. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.