[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.