Legal basis: Article 4 of the Law of People's Republic of China (PRC) on the Prevention and Control of Infectious Diseases adopts the prevention and control measures of Class A infectious diseases as mentioned in this Law for infectious atypical pneumonia in Class B infectious diseases, pulmonary anthrax in anthrax and human infection with highly pathogenic avian influenza. If other Class B infectious diseases and infectious diseases with unknown causes need to take the measures of prevention and control of Class A infectious diseases as mentioned in this Law, the administrative department of public health of the State Council shall promptly report to the State Council for approval before promulgation and implementation. If it is necessary to lift the measures for prevention and control of Class A infectious diseases taken in accordance with the provisions of the preceding paragraph, the administrative department of health of the State Council shall make an announcement after reporting to the State Council for approval. The people's governments of provinces, autonomous regions and municipalities directly under the Central Government may, according to the situation, decide to manage and publish other endemic infectious diseases that are common and frequent within their respective administrative areas according to Class B or Class C infectious diseases, and report them to the health administrative department of the State Council for the record.