China News Service, Yinchuan, August 20 (Reporter Yang Di) The 5th China-Arab States Expo Big Health Industry Forum and the 3rd "Internet + Medical and Health" Application Conference was held in Yinchuan, Ningxia on the 20th. Zhong Nanshan, academician of the Chinese Academy of Engineering, was at the meeting In a video speech, he said that the Delta virus focuses on prevention. After more than 80% of the Chinese population is vaccinated with the new crown vaccine, it is possible to establish effective herd immunity.

  At the meeting, Zhong Nanshan made an analysis and introduction on topics that people are more concerned about, such as the prevention and control of new crown virus infection, herd immunity, new crown vaccination, and the Delta virus strain.

Zhong Nanshan, academician of the Chinese Academy of Engineering, delivered a video speech at the meeting.

Photo by Xie Yu

  Zhong Nanshan analyzed the local transmission of the Delta virus strain in many provinces and cities in China in the past three months. He said that the Delta virus strain has the characteristics of strong infectivity, short incubation period, high viral load, and long time to turn negative.

  Zhong Nanshan introduced that taking the Delta virus strain found in Guangzhou as an example, according to statistics, about 1 can be transmitted (infected) 4, and 4 then 16 can be transmitted. At this ratio, the Delta virus strain will pass after four generations. Mass spread.

"So now (for the Delta virus strain), the most important thing is not treatment, but prevention. It is necessary to cut off its spread so that the problem can be solved." Zhong Nanshan said.

  Zhong Nanshan said that for the Delta virus strain, the source of infection should be quickly identified, the transmission chain should be accurately identified, and the concept of "close connection" should be updated at the same time.

  Regarding herd immunity, Zhong Nanshan said that now the whole world is adopting large-scale vaccination to establish herd immunity, and this requires at least 2-3 years of global collaboration.

  And how high is the vaccination rate to achieve "herd immunity"?

Zhong Nanshan said that this is related to the effectiveness of the vaccine and the spread of the virus.

"The effective rate of vaccines in China is about 70%, so China needs more than 80% of the entire population to be vaccinated to be able to establish an effective herd immunity. Now, the vaccination rate in China may reach more than 80% by the end of this year. "Zhong Nanshan said.

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