COVID-19 infection will be adjusted from "Class B A" to "Class B B" from January 8, 2023. What are the conditions for policy adjustment? What are the main changes in epidemic prevention and control measures? Can the medical resource reserve meet the need for treatment? The joint prevention and control mechanism of the State Council held a press conference on the 27th to respond to relevant hot issues. Seeking truth from facts, taking the initiative, optimizing and improving prevention and control policies in line with the situation "At present, with the virus mutation, epidemic changes, vaccination popularization and accumulation of prevention and control experience, China's COVID-19 prevention and control has entered a new stage." Li Bin, deputy director of the National Health Commission, said that we should closely follow the characteristics of the virus, study and judge the epidemic situation, accelerate the promotion of vaccination and drug supply, strengthen the construction of medical treatment and prevention and control system Factors such as improving emergency response capability have created conditions for China to adjust the legal classification of COVID-19 infection. Li Bin said that the adjustment of COVID-19 infection from "Class B A control" to "Class B B control" in accordance with the law is a major adjustment of the epidemic prevention and control strategy, which reflects seeking truth from facts, taking the initiative, optimizing and improving the prevention and control policy according to the situation. After the adjustment, it is not a matter of laissez faire, nor does it mean that all prevention and control measures are withdrawn, but it is necessary to continue to strengthen management, service and guarantee. Liang Wannian, the leader of the expert group of the leading group of the National Health Commission on epidemic response and disposal, said that "Class B management" was not laissez faire, and the focus of work should be shifted from infection prevention to medical treatment to ensure the smooth and orderly transition of prevention and control measures. There are four major changes in the adjusted prevention and control measures. According to the major changes in the epidemic prevention and control measures brought about by the implementation of "Class B B management" of public concern, the Deputy Director of the National Bureau of Disease Control, Chang Jile, introduced the following four aspects: first, in the aspect of infectious source discovery, the infected persons are found mainly through medical institutions, residents' self health monitoring, key population testing and other methods, instead of full staff nucleic acid screening and other methods. Second, in terms of infectious source management, we will take home health management for asymptomatic infected persons and mild cases, and no longer implement isolation treatment measures or isolation observation. Third, in terms of social prevention and control, prevention and control measures are more concentrated in key places, key institutions and key groups, and restrictions on activities of institutions and personnel in other places are cancelled or reduced to minimize the impact on the normal production and life of the masses. Fourth, in terms of border health and quarantine, measures such as closed loop transfer and centralized isolation will no longer be implemented for entry personnel. The personnel coming to China shall fill in the health declaration card according to the requirements of the customs, and the personnel who declare normally and have no abnormalities in the customs port routine quarantine can directly enter the community. Continuously expand medical resources to meet the needs of patients. At present, with the development of the epidemic entering different stages, the medical treatment needs of different regions are different. Some fever clinics have outstanding demand for diagnosis and treatment, while some emergency and severe treatment are under great pressure. In this regard, Jiao Yahui, Director of the Department of Medical Affairs of the National Health Commission, said that various regions are taking various measures to constantly expand medical resources, expand the supply of medical services and meet the needs of patients. In terms of treatment of critical patients, the following three points should be achieved: First, expand the national critical medical resources, expand and transform designated hospitals and sub designated hospitals as required, and increase secondary medical care