[Explanation] Currently, the new crown pneumonia epidemic is raging around the world.

As a powerful weapon against the disease, the new crown vaccine has high expectations.

How safe is the vaccine?

How to achieve herd immunity?

Recently, Shao Yiming, a researcher at the Chinese Center for Disease Control and Prevention and a consultant to the World Health Organization's Vaccine R&D Committee, accepted an exclusive interview with China News Agency "China Focus Face-to-face" to give authoritative answers.

  [Explanation] Data show that as of 24:00 on February 3, China has reported a total of 31.236 million doses of new coronavirus vaccines for key populations.

Shao Yiming pointed out that at present, China's vaccination rate and coverage rate are among the highest in the world.

  [Concurrent] Shao Yiming, researcher of the Chinese Center for Disease Control and Prevention, consultant of the World Health Organization Vaccine Research and Development Committee

  It should be said that our country’s research on the new crown (pneumonia vaccine) at least belongs to the world’s first legion. We are the first country to start clinical trials, and we are also the first country to start phase III clinical trials.

We are also the first country to approve vaccines for emergency use in July (2020). It should be ours that is very fast.

  [Explanation] At present, the global new crown vaccine research and development units are mainly concentrated on several technical routes, including inactivated vaccines, adenovirus vector vaccines, and nucleic acid vaccines.

In terms of safety, Shao Yiming pointed out that the inactivated vaccine research and development process for vaccination in China is relatively mature, safe and reliable.

  [Concurrent] Shao Yiming, researcher of the Chinese Center for Disease Control and Prevention, consultant of the World Health Organization Vaccine Research and Development Committee

  So in medicine, what is the safest thing and what kind of medicine and vaccine are the safest, it must pass the test.

Its "gold standard" is the number of people and the duration of the test. The more people and the longer the test, the safer the drug. In this sense, it is precisely the traditional use of our country. The technical route of inactivated vaccines has been used for hundreds of years, and it has been used by all mankind, and has been tested for hundreds of years, so this technical route should be said to be the most reliable.

  [Explanation] Talking about how to establish the herd immunity barrier in China, Shao Yiming said that after calculations, the inoculation rate required for the establishment of herd immunity is about 66%, combined with the 70% to 80% protection rate and transportation of the Chinese new crown inactivated vaccine 80% of people are vaccinated for the loss in the process, which can realize the herd immunity barrier.

As for when to establish, multiple factors need to be considered.

  [Concurrent] Shao Yiming, researcher of the Chinese Center for Disease Control and Prevention, consultant of the World Health Organization Vaccine Research and Development Committee

  In the past year, the new coronavirus has been reported in the scientific community. The re-infection also means that this virus is in some people. It is difficult for us to calculate this ratio. Its immunity Not particularly durable.

In other words, it is restricted by how high the protection rate of the first wave of vaccines is, and the second is how long its immunity can be maintained after vaccination, and it is also restricted by this.

  [Explanation] Shao Yiming predicts that, given that countries are currently improving epidemic prevention and control strategies, coupled with the current large-scale vaccination of the new crown vaccine, the global epidemic prevention and control situation will change for the better.

By the summer of 2021, when it is not conducive to the spread of respiratory diseases, the northern hemisphere will be stable, and the world will be able to respond more securely to future epidemic prevention and control.

  Peng Danni, Liu Chao, Li Shuoxing reporting from Beijing

Editor in charge: [Li Ji]