After COVID-19 infects "Class B and Class B", no high and low risk areas will be defined. However, some institutions and places where people are concentrated and vulnerable groups such as the elderly are concentrated should not be neglected. "After the implementation of the" Class B and Class B management "measures, key groups, key institutions and key places are still the focus of prevention and control. There are many high-risk groups, people are concentrated in places such as pension institutions and social welfare institutions, and the risk of epidemic spread is high. Health monitoring and early intervention should be strengthened to ensure that serious high-risk personnel can be found, transferred and treated in a timely manner. Employees in business supermarkets, logistics, catering, transportation and other industries should strengthen personal prevention " Mi Feng, spokesman of the National Health and Health Commission and deputy director of the Publicity Department, said at the press conference of the joint prevention and control mechanism of the State Council on January 11. After carrying out health monitoring "Class B and B management" for key institutions and places, which institutions and places are the focus of epidemic prevention and control? Chang Zhaorui, a researcher at the Communication and Prevention Department of the China Center for Disease Control and Prevention, said that key institutions mainly include elderly care institutions, service institutions in the field of children's welfare, mental health welfare institutions, schools, postal express, medical institutions, etc. Key places mainly include passenger stations, shopping malls, supermarkets, agricultural trade (market) markets, catering service units, bathing service units and other places with dense personnel, tight space and prone to cluster epidemic. These institutions and places should implement the unit's prevention and control responsibilities and individual vaccination, self-protection, health monitoring, environmental cleaning and disinfection, ventilation and other measures. The Omikjon mutant spreads rapidly, and key institutions and places are densely staffed. Once an infectious source is introduced, it is easy to spread in a short time. "Under the implementation of routine prevention and control measures in key institutions and places, the epidemic situation should be detected as soon as possible through health monitoring and antigen or nucleic acid detection," said Chang Zhaorui. So, how to strengthen monitoring? Chang Zhaorui pointed out that for places where vulnerable people gather, such as social welfare institutions, the body temperature of all staff and the monitoring of symptoms related to COVID-19 infection should be carried out at least twice a day. According to whether the institution adopts closed management, regular nucleic acid or antigen detection shall be carried out for the staff in the institution and the persons under care. In case of suspicious symptoms, nucleic acid or antigen detection shall be taken in time. Medical institutions should focus on the detection of antigen or nucleic acid in patients with severe high risk, timely detection and management of infected persons, and reduce the spread and spread of the epidemic in medical institutions. The staff of other key institutions and key places should strengthen monitoring, and timely carry out antigen detection and nucleic acid detection when symptoms occur. Formulate operational guidelines for epidemic prevention and control in shopping malls, supermarkets and other places. During the Spring Festival, shopping malls, supermarkets, farmers' markets and other places have relatively large passenger flow. How to do a good job in epidemic prevention and control? Geng Hongzhou, the first level inspector of the Department of Consumption Promotion of the Ministry of Commerce, said that while strengthening market monitoring and early warning, guiding commercial circulation enterprises to increase stock up efforts and ensure adequate supply of necessities in the market, the Ministry of Commerce, in strict accordance with the overall plan of "Class B and Class B management", has formulated operational guidelines for the prevention and control of COVID-19 infection in key places such as shopping malls, supermarkets, farmers' (fairs) markets, and has clarified the prevention and control system, environmental health Employees' health protection and other requirements to guide the industry to do a good job in prevention and control