The effect of the new crown vaccine declines after half a year

Zhong Nanshan said that it is necessary to replant the strengthened needles in time, and the epidemic prevention and control must not be relaxed

　　Nanfang Daily (Reporter/Zheng Huizi and Fu Peng) “The third dose of the new crown vaccine must be replanted in time after the two doses of the new crown vaccine.” On the evening of November 11, the Global Mayors Forum opened in Guangzhou. Zhong Nanshan, an academician of the Chinese Academy of Engineering, wrote “Guangzhou In his keynote speech on the characteristics and prevention of the new crown Delta variant infection, he said, “Regardless of whether the whole virus inactivated vaccine or mRNA vaccine, the humoral immune function is significantly reduced after a period of treatment, and countries are discussing how to strengthen immunity.”

　　At the scene, Zhong Nanshan showed the data released by the Chilean Ministry of Health on October 7 this year.

Data show that after Kexing strengthened immunity, the protective effect was enhanced, the protective effect of symptomatic new coronary cases increased from 56% to 80%, and the protective effect of hospitalized cases increased from 84% to 88%.

　　In Zhong Nanshan's view, the current difficulty in epidemic prevention and control lies in balance, on the one hand, restarting the economy, on the other hand, controlling the epidemic.

"This requires precise prevention and control." He said, but he also emphasized that precise prevention and control does not mean increasing levels. Too much increase will affect economic development.

　　When will normalcy be restored?

Zhong Nanshan believes that under the premise that the virus fatality rate is controlled at 0.1%, the replication index is controlled at 1.0-1.5, and the transmission coefficient is reduced, full opening can be achieved.

However, to realize these prerequisites, it is necessary to adopt universal vaccination, establish herd immunity, normalize community prevention and control, and develop effective drugs.

　　Among them, the production of herd immunity depends on two ways.

The first is to adopt uninterrupted infection, that is, natural infection, but 70%-80% of the population needs to be infected. According to the 2.1% mortality rate, through natural infection to achieve herd immunity, the global death toll will reach 12.64 million. Zhong Nanshan It means that this approach is unrealistic, unscientific, and inhumane.

　　Another way to achieve herd immunity is mass vaccination, even if most people are immune, so as to curb the spread of infectious diseases, this requires 2-3 years of global collaboration to achieve.

As of November 9, 1.073 billion people across the country have completed the full vaccination, 41.713 million have completed the booster vaccination. According to Guangzhou's data, 17.321 million people have completed the full vaccination, accounting for 92.7%, and 836,000 people have received the booster vaccination.

　　He also mentioned that when the Delta variant appeared in Guangzhou in May this year, none of the vaccinated patients had a serious illness.

In view of the short incubation period and rapid spread of Delta mutant strains, Guangzhou has also taken many effective measures.

Later, when an epidemic broke out across the country, the practice of Guangzhou was also referenced.

　　Zhong Nanshan introduced Guangzhou’s experience in dealing with Delta mutant strains, including: updating the concept of "close connection", formulating closed and sealed control modes for the Delta virus classification; adopting a "yellow code" system to detect high-risk areas through big data The “yellow code” sign is given to the population, and nucleic acid testing is required to be completed as soon as possible, and the frequency of nucleic acid testing for “yellow code” personnel is increased; the “Falcon” air film laboratory is set up for large-scale rapid screening; the Guangzhou International Health Station is built to provide A smart and safe quarantine zone.

Under a series of measures, the transmission index of Delta variants in Guangzhou has been continuously reduced.

　　"Every corner is uneasy, and the world is at stake." Zhong Nanshan once again emphasized that the prevention and control of the epidemic must not be slack.