The epidemic situation in Shanghai has shown a downward trend for several consecutive days, and the overall epidemic situation in 6 districts such as Pudong and Songjiang has continued to decline in the past three days. However, why are there still positive infected people in the community since the implementation of the lockdown control and epidemic prevention measures? Why should Shanghai's sealing and control areas continue to carry out continuous nucleic acid screening? CCTV's "Oriental Time and Space" column reported on April 21 that Zhao Jing, an expert in the Shanghai Working Group of the State Council's Joint Prevention and Control Mechanism Comprehensive Group, said that once there are positive patients in the community, it will cause transmission between households and between buildings, so it is necessary to quickly find out the source of infection.
Why are there still positive infected people in the community since the implementation of the lockdown control and epidemic prevention measures? Zhao Jing said in an interview with "Oriental Time and Space" that there may be the following reasons for the continuous emergence of positive cases in the sealing and control area: First, the new crown virus has a certain incubation period, and the incubation period may not be screened; second, a screening may not be found, and it takes round after round of screening to be found, which in turn causes some communities to have no positive cases before and have recently been found, and there are similar situations throughout the country.
Why round after round of nucleic acid screening? Zhao Jing explained that according to the national dynamic zeroing strategy, the premise of large-scale nucleic acid screening is that there are positive infected people in the community, and once there are infected people, it is possible to cause transmission between people, transmission between households, and transmission between buildings. The Omilon strain is passed down from generation to generation in less than three days, and the source of infection is "pulled out" before the virus may have had time to spread to the next generation. Therefore, it is hoped that the public will cooperate and quickly find out the positive infected people through round after round of non-stop screening. Only to find out the source of infection, follow-up can be traced back to the source, community sealing, isolation and control, etc., all subsequent actions need to be based on the front nucleic acid detection, that is, the discovery of the source of infection.
Zhao Jing suggested that when residents go downstairs to take samples, they must wear masks, keep their distance, and do a good job of personal hygiene. (Chen Longfei)
