[Improvement of China's legal system for public health emergency management from the perspective of lifecycle management].

A crucial lesson gained through the pandemic preparedness and response to COVID-19 is that all measures for epidemic control must be law-based. The legal system is related not only to public health emergency management per se but also to all aspects of the institutional supporting system throughout the lifecycle. Based on the lifecycle emergency management model, this article analyses the problems of the current legal system and the potential solutions. It is suggested that the lifecycle emergency management model shall be followed to establish a more comprehensive public health legal system and to gather the intelligence and consensus of experts with different expertise, including epidemiologists, sociologists, economists, jurist and others, which will collaboratively promote the science-based legislation in the field of epidemic preparedness and response for the establishment of a comprehensive legal system for public health emergency management and with Chinese characteristics.

[The dynamic COVID-zero strategy on prevention and control of COVID-19 in China].

Since April 2020, the epidemic of novel coronavirus pneumonia epidemic (COVID-19 epidemic) in China has entered the phase of normalized prevention and control. After the exploration phase of normalized prevention and control, China's epidemic prevention and control has entered the "dynamic COVID-zero" phase of whole-chain precise prevention and control. The dynamic COVID-zero strategy is to follow the premise of "external prevention of import, internal prevention of rebound" prevention and control strategy, when the emergence of local COVID-19 cases, to take effective comprehensive prevention and control measures, and to "find one, extinguish one", to quickly cut off the chain of epidemic transmission, so that each epidemic is terminated in a timely manner, achieving maximum effectiveness with minimum cost. With the application of new technologies such as large-scale nucleic acid detection and big data tracking, the dynamic COVID-zero strategy was developed, which is China's novel experience in the prevention and control of COVID-19 epidemic. The dynamic COVID-zero strategy is an innovative prevention and control strategy proposed and implemented in China during the normalized prevention and control phase of the COVID-19 epidemic, whose prevention and control objectives, technical means, and work focus are different from the traditional "containment" strategy and "mitigation" strategy on ending the epidemic. This paper analyzes and summarizes the three phases of COVID-19 epidemic prevention and control in China, the dynamic COVID-zero strategy and its scientific connotation, evolutionary process, theoretical basis, implementation phases and effects, and provides a scientific basis for epidemic prevention and control in winter and spring.

[Experience and thinking on the normalization stage of prevention and control of COVID-19 in China].

COVID-19 is an important public health issue of great concern at home and abroad, and it is still in the state of global pandemic. During the normalization stage of prevention and control of the epidemic of COVID-19, China effectively controlled the outbreak and spread of the epidemic by adopting the strategy of "import of external prevention and rebound of internal prevention", and effectively reduced the occurrence of death cases. The social economy recovered quickly, and various measures were highly recognized by the public, and the positive trend of the epidemic continued to consolidate. At present, although the spread of the local epidemic has been basically stopped, the international epidemic continues to rise rapidly, and the pressure of "imported prevention and control" in China continues to increase. Considering the characteristics of the normalization of epidemic prevention and control and the particularity of the virus, the connotation of the normalization of epidemic prevention and control should be understood scientifically. The prevention and control goal of the epidemic in the normalization stage should be to maximize early detection, early treatment and early disposal, and resolutely prevent the continuous spread of the epidemic in communities, that is, to prevent the infection as much as possible, and resolutely prevent the rebound (sustained spread in communities), rather than "zero infection". The prevention and control policy of "timely detection, rapid disposal, precise management and control, and effective treatment" has been implemented in various localities, and a series of effective and regular experience in prevention and control has been formed in the practice of prevention and control. Winter and spring are the key periods for the prevention and control of the epidemic. We should continue to work together to prevent and control the epidemic, fulfill the responsibilities of all parties, and prevent and control the epidemic in a scientific and effective way.