"Under normal circumstances, emergency prevention and control measures are generally not required." On January 8, the joint prevention and control mechanism of the State Council held a press conference. Lei Zhenglong, the director of the Department of Communication and Prevention of the National Bureau of Disease Control and Prevention and the first level inspector, explained the latest version of the prevention and control plan, and pointed out that during the outbreak of the epidemic, temporary prevention and control measures can be taken in due time and according to law in combination with viral variation, epidemic intensity, medical resource load and social operation. What are the emergency prevention and control measures? When to take emergency prevention and control measures? Will the dominant strains of other countries form a new round of transmission in China? The new version of the prevention and control plan has been adjusted. On January 7, the joint prevention and control mechanism of the State Council issued the Prevention and Control Plan for novel coronavirus Infection (Tenth Edition). The plan continues to emphasize personal protection, develop good health habits, strengthen vaccination, and strengthen epidemic prevention and control in key places, key groups, key institutions and rural areas. The plan has also been adjusted in several aspects, including strengthening monitoring and early warning, adjusting detection strategies, and taking emergency prevention and control measures during the epidemic period. Lei Zhenglong introduced that under the normal situation, we mainly carried out virus mutation monitoring, case reports, sentinel hospital monitoring, unexplained pneumonia monitoring, urban sewage monitoring, etc. In case of emergency, nucleic acid and antigen detection and monitoring, fever clinic monitoring, and key institutions monitoring will be added. Lei Zhenglong said that during the outbreak of the epidemic, the purpose of taking temporary prevention and control measures in a timely and lawful manner is to reduce the concentration of people, reduce the flow of people, reduce the incidence rate, alleviate the impact of the rapid increase of infected people on social operations and medical resources in a short period of time, and effectively coordinate the prevention and control of the epidemic situation and economic and social development. What are the emergency measures? When to take? The emergency measures listed in the plan include: suspending unnecessary large-scale activities; Suspension of business activities of large entertainment venues; Current limiting measures shall be taken in museums, art galleries and other indoor public places; Strictly manage the elderly care institutions, social welfare institutions, psychiatric hospitals and other places where vulnerable people gather; Enterprises, institutions, factories, etc. implement staggered commuting, flexible working system or take home office measures; Kindergartens, primary and secondary schools and institutions of higher education adopt temporary online teaching. Lei Zhenglong introduced that, according to the relevant provisions of the Law on the Prevention and Control of Infectious Diseases, when an infectious disease breaks out and prevails, the local people's government at or above the county level can take some emergency epidemic prevention and control measures and make a public announcement when necessary and with the consent of the people's government at a higher level. When the COVID-19 breaks out and prevails, some emergency prevention and control measures can also be taken timely, according to law and selectively. Once the epidemic situation is alleviated, the local government should promptly announce the lifting of emergency prevention and control measures. Lei Zhenglong introduced that the difficulty of epidemic prevention and control increased during the Spring Festival. Experts believed that the peak period of epidemic epidemic in some parts of the country coincided with the Spring Festival transportation and the Spring Festival holidays. During the Spring Festival, there was a large flow of people, many gathering activities, especially more indoor activities, which would further increase the risk of epidemic transmission, and also increase the difficulty and complexity of epidemic prevention and control during the Spring Festival. "We encourage people to avoid visiting relatives and traveling in areas with high prevalence of the epidemic, and encourage people in areas with high prevalence of the epidemic to reduce their travel." Lei Zhenglong said that according to the situation of the epidemic, we should try not to hold large-scale temple fairs and large indoor posters