On May 21, at the 341st press conference on the prevention and control of novel coronavirus pneumonia in Beijing, xuhejian, deputy director of the Publicity Department of the municipal Party committee, director of the Information Office of the municipal government and spokesman of the municipal government, introduced the need to promote nucleic acid screening with high quality, strengthen the supervision of third-party testing institutions, improve the quality and efficiency of testing, and severely punish illegal acts according to law. Compact the "four party responsibility" and strictly implement measures such as entering organs, enterprises and institutions, communities (villages) and public places to measure temperature and scan codes, and check the negative certificate of nucleic acid test within 48 hours. Comprehensively improve the emergency response capacity, and strengthen the collection and reserve of centralized medical observation houses, epidemic prevention materials and service support forces.