Infectious diseases that need to be reported within two hours include Category A infectious diseases, and of course some Category B infectious diseases also need to be managed according to Category A infectious diseases. Category A infectious diseases include plague and cholera, while Category B infectious diseases, which are currently prevalent as new coronaviruses, also follow Category A infectious diseases for management. Infectious diseases are diseases caused by various pathogens that can be transmitted from person to person, from person to animal or from animal to animal, with most of the pathogens being microorganisms and a small percentage of the pathogens being parasites. China’s infectious disease prevention and control law provides that infectious diseases are divided into three categories, A, B and C, a total of 39 types.