On March 23, Shanghai held a press conference on epidemic prevention and control. Wu Jinglei, director of the Shanghai Municipal Health Commission, said that the number of cases has remained high recently, and Shanghai is facing the epidemic situation since the normalization of prevention and control. The most serious and complex challenge.
On March 23, according to the Shanghai Health Commission, from 0-24:00 on March 22, there were 4 new confirmed cases of local new coronary pneumonia in Shanghai, and 977 asymptomatic infections. According to statistics, from 0:00 on March 1 to 24:00 on March 22, Shanghai added a total of 244 new local confirmed cases and 4,746 new asymptomatic infections. The number of asymptomatic infections was 19 times the number of confirmed cases. many.
As of 24:00 on March 22, 2022, a total of 636 local confirmed cases in Shanghai and 4,465 asymptomatic infections are still under medical observation, including 4,408 local asymptomatic infections and 4,408 overseas asymptomatic infections. There were 57 imported asymptomatic infections.
Why are there so many asymptomatic infections in Shanghai? On March 22, Fu Chen, director of the Shanghai Center for Disease Control and Prevention, explained at a press conference on epidemic prevention and control that according to national standards, asymptomatic infections refer to those who have tested positive for the etiology of the new coronavirus but have no relevant clinical manifestations. Discovery of contacts and close contacts, entry personnel, high-risk groups, and population screening.
The proportion of asymptomatic infections and the etiological characteristics (the new coronavirus in the current round of epidemic in Shanghai is classified as the BA. , rapid transmission, short incubation period, atypical clinical symptoms), human resistance (the average age of infected persons in this round is 40.6 years old, the median age is 40 years old, and the proportion of people under 60 years old accounts for 84.5%, and the overall infected persons are in the middle Mainly young people, with good health, strong body resistance, and a correspondingly high proportion of asymptomatic), vaccination (the vast majority of people infected with this round of epidemic have been vaccinated against the new crown throughout the whole process, the population immunity is enhanced, and asymptomatic infections are The proportion will also increase), detection method (asymptomatic infections are mainly found through nucleic acid testing, population screening, etc. Recently, Shanghai has carried out regional grid nucleic acid screening, and a certain number of positive infections have been found, including Asymptomatic infection in the incubation period and early stage) and so on.
Wu Jinglei said that after the last round of nucleic acid screening in key and non-key areas, a considerable number of towns and communities have met the requirements to lift the lockdown. According to the analysis and judgment of the test results, continue to follow the principle of dicing and gridding, and delineate some streets and towns (the encircling circle has been reduced) to carry out another nucleic acid screening. The specific time is from 0:00 on the 23rd to 24:00 on the 24th. Town-community-buildings” carry out follow-up nucleic acid screening and control work step by step.
At the press conference on March 23, a reporter asked a question that many citizens were concerned about, “I’m all negative in the screening, why didn’t you unblock me?” In this regard, Shanghai Wu Fan, a member of the expert group of the Municipal Leading Group for Epidemic Prevention and Control and Vice Dean of Shanghai Medical College of Fudan University, explained that a large number of screenings have recently adopted mixed testing methods. ) individuals, unlike hospital peer-to-peer testing.
“The community first notified the test twice in 48 hours, and then notified it twice in 48 hours, and notified it again to do a 24-hour test. In this case, why not just notify at the beginning 5 days?” Wu Fan explained that this is related to the grid-based method of “reducing flow + nucleic acid screening” adopted by Shanghai this time. The key areas identified this time are delineated based on the development of the previous epidemiological epidemic, the number of cases, and the possible potential risks of transmission methods, and are demarcated in units of streets and towns. Targeted and more precise.
Editor in charge: Qiao Jingfang
