At the press conference held by the joint defense and control mechanism of the State Council on the 17th, Mi Feng, a spokesman of the National Health Commission and deputy director of the Propaganda Department, said that we should accurately understand and grasp the deployment measures to optimize the prevention and control work, and firmly oppose the two tendencies. We should not only continue to rectify and increase the number of layers, prevent "one seal", but also oppose irresponsible attitudes, prevent "letting go", and ensure that 20 measures are implemented without fail, We will ensure people's safety and health. Will it cause hidden risks if we no longer judge the secret connection? With regard to the social concern that no longer judging whether tight connections will cause hidden risks, Shen Hongbing, Deputy Director of the National Bureau of Disease Control and Prevention and an academician of the CAE Member, said that this is a more scientific and accurate prevention and control measure based on the size of infection risk. No more centralized isolation of such people is needed to more effectively use prevention and control resources and service guarantee resources such as flow regulation and isolation. He said that at present, in some places, it is unnecessary to directly determine the tight connection as a tight connection for promotion and control. "At the same time of determining the tightness of the cancelled joint, all localities should make quick determination, quick detection, and quick control of the joint. Once the nucleic acid test of the joint is positive, further investigation and control of the joint should be carried out at the first time, which requires more work." Will the cancellation of medium risk areas have an impact on accurate prevention and control? "In order to minimize the control of unnecessary regional personnel, 20 optimization measures have canceled the determination of the central risk zone." Wang Liping, a researcher from the Communication and Prevention Department of the China CDC, said that this is a higher standard for the handling of epidemic situations in various regions, requiring more accurate and efficient flow survey and risk research and judgment. The nucleic acid detection and control measures in high-risk areas are still implemented according to the ninth version of the prevention and control plan. It is required that nucleic acid detection should be carried out three days before the implementation of sealing control, and the frequency of subsequent detection can be determined according to the results of the first three tests. Within 24 hours before the release of management, the whole staff nucleic acid test in the area shall be completed. Wang Liping stressed that for the elderly living alone, minors, pregnant women, disabled persons, people with mobility difficulties, hemodialysis patients, patients with mental diseases, and patients with chronic diseases in the closure and control management area, they should do a good job of touch and drainage, and provide them with better living materials and medical supplies. Does the requirement to develop a graded and classified diagnosis and treatment plan for COVID-19 mean that the diagnosis and treatment of COVID-19 patients should be graded and classified in the future? Guo Yanhong, Director of the Medical Emergency Department of the National Health Commission, said that one of the 20 measures is to strengthen the construction of medical resources, which is also a specific requirement for faster, better and more efficient treatment of the epidemic in combination with the actual situation of the current epidemic prevention and control, as well as an important measure to better coordinate the epidemic prevention and control and daily medical service guarantee, and adhere to improving the quality of medical services. Guo Yanhong said that since the outbreak of the epidemic, we have strengthened capacity building and classified treatment of patients from three aspects. First, all localities are required to designate hospitals with strong comprehensive capacity and high treatment level as designated hospitals. Designated hospitals shall provide sufficient beds for treatment according to the local population size, and ICU beds shall reach 10% of the total number of beds. Second, strengthen shelter medicine