The joint prevention and control mechanism of the State Council held a press conference on the 27th to introduce the implementation of "Class B and Class B" measures for COVID-19 infection. "At present, China's epidemic prevention and control has entered a new stage, facing new situations and new tasks, and the focus of work has shifted from 'infection prevention' to 'health protection and severe disease prevention'," said Mi Feng, a spokesman of the National Health Commission. The implementation of "Class B and Class B management" is an adjustment of prevention and control strategies based on the comprehensive assessment of virus mutation, epidemic situation and prevention and control work in China. It is an initiative to seek truth from facts, optimize and improve prevention and control measures according to the situation and time, and is to constantly improve the scientific, accurate and effective nature of prevention and control work. The implementation of "Class B and Class B management" is not to let go, but to strengthen service and guarantee. We should pay close attention to the preparation of medical treatment resources, make efforts to meet the needs of the masses for drug use, do our best to protect and treat the elderly, children and other key groups, especially strengthen the vaccination and health management of the elderly, and effectively strengthen the prevention and control of epidemics in rural areas. Li Bin, deputy director of the National Health Commission, said that in the past three years, China has withstood the impact of five waves of epidemic situations in the world, successfully avoided the widespread prevalence of highly pathogenic original strains and Delta mutants, greatly reduced the severity and death, and won precious time for the development and application of vaccines, drugs, medical resources and other resources, effectively protecting the life safety and health of the people, Significant positive results were achieved in coordinating epidemic prevention and control and economic and social development. At present, with the virus mutation, epidemic situation change, vaccination popularization and prevention and control experience accumulation, the prevention and control of the COVID-19 in China has entered a new stage, and the prevention and control work is facing a new situation and new tasks. COVID-19 infection has been adjusted from "Class B, Class A" to "Class B, Class B, Class B", fighting a prepared battle. Jiao Yahui, Director of the Department of Medical Affairs of the National Health Commission, said that as the epidemic situation has entered different stages, the needs of different regions are different. "We have taken a variety of measures to guide local governments to continuously expand medical resources, expand the supply of medical services, and meet the needs of patients for diagnosis and treatment." Jiao Yahui introduced that, in terms of expanding medical resources for fever clinics, the National Health Commission has mainly taken measures such as expanding the capacity of fever clinics, promoting hierarchical diagnosis and treatment, providing Internet diagnosis and treatment services, and increasing drug supply through multiple channels. Chang Jile, Deputy Director of the National Bureau of Disease Control, introduced that COVID-19 infection was adjusted from "Class B A control" to "Class B B control". After the adjustment, the focus of prevention and control measures can be briefly summarized as "three priorities and one major": first, strengthen the protection of key populations. Further improve the vaccination rate of COVID-19 vaccine for the elderly, ensure adequate drug supply, carry out health surveys for high-risk groups such as the elderly aged 65 and above, and do a good job in classified diagnosis and treatment services. Second, strengthen the prevention and control of key institutions. We will do a good job in the prevention and control of elderly care institutions, social welfare institutions, medical institutions, schools, pre-school education institutions and other key institutions where people are concentrated. During the epidemic, we will strengthen the health monitoring of personnel. We will take timely closed management of elderly care institutions and social welfare institutions to strictly prevent the occurrence of a cluster epidemic in institutions. Third, prevention and control of key industries. For the industries such as public security, transportation, logistics, water, electricity, gas, heating, supply and security that maintain the basic operation of society, strengthen the personal protection of employees and the ventilation and disinfection of the working environment, and establish the system of personnel rotation and post preparation