Why are there more than asymptomatic infections in the recent epidemic?Expert explained like this

On August 10, the Chongqing Municipal Government News Office held a press conference on the prevention and control of the 112nd new crown pneumonia. Luo Fei, chief physician of the Municipal Centers for Disease Control and Prevention, introduced the difference between several new crown pneumonia epidemic in our city:

1. It is caused by the input case outside the city but the input is different. The survey survey and genetic traceability confirmed that the recent epidemic situation in our city was a local epidemic caused by the return to the Chongqing infected cases outside the municipal infection, but the infection of the first case was different.

2. They are caused by the mutant strains of Omikon, but the evolution branches are different. Since August, although the strains that caused the epidemic in our city have belonged to the mutant strains of Omikon, they have caused different epidemics by evolutionary branches such as BA.5.1.3 and BA.2.76. This also confirms that the epidemic input is different.

3. Different discovery methods and time. Recently, several epidemic conditions, some infected people found in the screening of the city's foreign and Chongqing people who returned to the Chongqing people in key places. There are also people who return to the Chong like to strictly abide by the health management measures to come and return to the Chongqing. After returning to the Chongqing, they took the initiative to report, active nucleic acid detection, and actively monitored home health monitoring. During the health monitoring, it was found that the risk of epidemic dissemination was reduced. Subsequent infection.

Luo Fei said that there are three main reasons for those who have a large number of asymptomatic infections in the recent epidemic: First, because the poisoning force of Omikon's own poison has a relatively decrease, the above respiratory tract infection is the main. The rate is relatively low. Second, due to the increased coverage of the current vaccination, the proportion of severity of the vaccine in vaccination is significantly lower. The third is the timely detection of nucleic acids. The city's epidemic prevention and control strategy and classification control measures are in place. Most infected people in risk population screening and active nucleic acid testing are found during the incubation period, so the proportion of asymptomatic infections is relatively high.

Reporter: Li Yan Zhang Lingyi

Edit: Zhao Yingzhao

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