Category B infectious diseases are not all managed according to Category A infectious diseases. In order to better manage infectious diseases, the state has divided infectious diseases into three categories: category A, category B and category C, which are managed differently. Category A infectious diseases require reporting within 2 hours of discovery in urban areas and no more than 6 hours in rural areas, while Category B infectious diseases require reporting within 6 hours of discovery in urban areas and no more than 12 hours in rural areas. Class A infectious diseases include two kinds, namely plague and cholera, and class B infectious diseases currently have 26 kinds. Among the infectious diseases in category B, infectious atypical pneumonia, anthrax, pulmonary anthrax, human highly pathogenic avian influenza and poliomyelitis, although they are infectious diseases in category B, but must take the reporting and control measures for infectious diseases in category A. Therefore, category B infectious diseases are not all managed according to category A infectious diseases, only these four more specific diseases according to category A infectious diseases to manage.