Since the release of the 20 optimization measures, all regions have rapidly implemented and refined the implementation plan. How to implement the 20 optimization measures in a scientific and accurate manner to further improve the scientific, accurate and effective prevention and control of epidemic situation? The joint prevention and control mechanism of the State Council held a press conference on the 17th to respond to social concerns on relevant focus issues. Mi Feng, a spokesman of the National Health Commission, said that we should firmly oppose the two tendencies. We should not only continue to rectify "layer upon layer" and prevent "one seal", but also oppose irresponsible attitudes, prevent "one release", and ensure that 20 optimization measures are implemented to ensure people's life safety and health. Shen Hongbing, deputy director of the National Bureau of Disease Control and Prevention, said that we should implement the requirements of "preventing the epidemic, stabilizing the economy, and ensuring safe development", so as to prevent the epidemic and minimize the impact on economic and social development and people's livelihood services. Since the release of the 20 optimization measures, each region has taken more precise measures in isolation and transportation, nucleic acid detection, personnel mobility, medical services and other aspects in combination with its own reality. Some places are also correcting the practices that are inconsistent with the ninth version of the prevention and control plan and the 20 optimization measures in a timely manner, so as to further improve the scientific, accurate and effective prevention and control of the epidemic. At the same time, the special teams for dealing with the problem of "layer by layer overweight" played a leading role in guiding all parties to correct outstanding problems such as violations of the "nine prohibitions" requirements in a timely manner, correct acts of omission and disorderly behavior in a timely manner, and correct simple and crude practices such as "one seal" and "expanding the code" in a timely manner, effectively maintaining the normal production and living order of the people. To further improve the scientificity and accuracy of epidemic prevention and control, "the 20 optimization measures are a supplement and improvement to the ninth version of the prevention and control plan, not to relax, let alone relax and" lie down ", but to further improve the scientificity and accuracy of prevention and control." Shen Hongbing said. No longer identify the close contacts of close contacts The risk area is adjusted from "high, medium and low" to "high and low", and the high risk area is generally defined by units and buildings; Correct unscientific practices such as "two inspections a day" and "three inspections a day"; For close contacts and immigration personnel, the management measure of "7 days of centralized isolation+3 days of home health monitoring" was adjusted to "5 days of centralized isolation+3 days of home isolation"... "Such optimization and adjustment put forward a higher standard for epidemic situation disposal in various regions, requiring us to conduct more accurate and efficient flow surveys and risk studies and judgments, manage the risks under control, implement the measures in place, and resolutely cancel the cancellation." Wang Liping, a researcher at the China Center for Disease Control and Prevention, said. Strengthening the construction of medical resources is an important part of the 20 optimization measures. "We should not fight unprepared battles in the fight against the COVID-19 and the mutation of the virus, so we should strengthen the capacity building of medical services and the preparation of treatment resources." Guo Yanhong, director of the medical emergency department of the National Health Commission, said. Guo Yanhong said that we should continue to strengthen the construction of designated hospitals to meet the treatment needs of ordinary, severe, critical and other patients; Strengthen the construction of shelter hospitals, mainly to treat asymptomatic and mild infections; Strengthen the construction of fever clinics and strictly implement