Build a solid immune defense line to help prevent and control the epidemic

2,823.41 million doses, as of December 30, 2021, China's 31 provinces (autonomous regions and municipalities directly under the central government) and the Xinjiang Production and Construction Corps have cumulatively reported the number of covid-19 vaccines, and the total number of vaccinations and vaccination coverage ranks first in the world. From the production of the original solution to the preparation of the preparation, from the packaging of the finished product to the refrigerated storage, after a process, a vaccine is produced on the production line and enters the vaccination points in the streets and alleys of the country. Each vaccine is like a brick and stone, building an immune defense line against the virus little by little.

01

Vaccinations are a defense against COVID-19

The best way

Building a solid immune defense line is the fundamental strategy to defeat the epidemic. Wang Huaqing, chief expert of the immunization program of the Chinese Center for Disease Control and Prevention, said that the best way to prevent new crown pneumonia is to vaccinate, through vaccination, the immunity of the population reaches a certain threshold, so as to reduce the infection rate, reduce the severe disease rate, and reduce the case fatality rate. "Therefore, the most important thing is to maintain a high vaccination rate and achieve the effect of the vaccine."

"Historical experience in the prevention and control of infectious diseases such as smallpox, measles, polio and so on has taught us that vaccines are effective weapons to defeat the virus." Zheng Zhongwei, head of the vaccine research and development working group of the scientific research group of the joint prevention and control mechanism of the State Council, said that after the whole process of vaccination against the new crown virus, the human immune system will remember the enemy of the virus, once infected with the virus, the human body can produce a large number of antibodies in a short period of time, the virus will be quickly cleared, thereby reducing the risk of re-transmission, and can effectively prevent the transformation of the disease to severe or critical illness. Vaccines used domestically or abroad have a certain effect on the prevention of infection, a clear effect on retransmission after infection, and a significant effect on the prevention of severe illness and death. "Please be sure to strengthen your confidence in china's new crown vaccine." We call on everyone to speed up the promotion of vaccination and ensure that it is necessary to receive it. ”

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Vaccinations are proven in practice

It can reduce the mortality rate of severe illness

In May 2021, guangzhou's cluster was the first head-to-head confrontation with the mutant strain Delta. Compared with other strains, Delta strains have the characteristics of faster transmission, faster replication in vivo, and longer yin time. Feng Zijian, secretary general of the Chinese Preventive Medicine Association, introduced that if there is no strong prevention and control measures to intervene, if there is no vaccine immunization to block the spread of the virus, then the spread of the epidemic will be very significant.

"Judging from the epidemic situation in Nanjing and Yangzhou in the early stage, the new crown vaccine has played an important role in the epidemic." Zheng Zhongwei said that in severe cases, those who completed two doses of COVID-19 vaccination accounted for less than 5% of severe cases, that is, more than 95% of severe cases were people who were not vaccinated or did not complete immunization procedures. In the severely ill population over the age of 60, more than 90% of people are not vaccinated or have not completed vaccination.

Since 2021, China has rapidly handled dozens of clusters of epidemics and been able to control the epidemic in a relatively short period of time, one of the important reasons is the high vaccination rate in the country. He Qinghua, a first-level inspector of the Disease Control Bureau of the National Health Commission, said that the existing vaccine still has a good preventive and protective effect, which can reduce the risk of transmission of the new crown virus in the population, reduce the spread of infected people, and effectively reduce the incidence of severe illness and case fatality after infection.

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Science steadily expands the vaccinated population

From high-risk groups, key groups to the general population, from the elderly over 60 years old to children aged 3 to 11 years old, over the past year, China's new crown vaccination population has gradually expanded, and everyone is an important part of this immune defense line.

"With the changes in the epidemic situation and the continuous spread of the epidemic, we have a new understanding of the new crown virus." Wang Huaqing said that from the past, the incidence and prevalence of children were not high, and now the prevalence of children is rising; from the past when children's symptoms were mild, there are also some serious cases now. "Adolescents and children are an integral part of building immune defenses."

"Accelerating the vaccination of the elderly is of great significance to the elderly, both for the elderly themselves, for their families and society." Zheng Zhongwei said that most of the elderly have underlying diseases, and once infected, the risk of severe illness and death is much higher than that of young people. Taking the sporadic epidemic in Guangdong, Jiangsu and other places as an example, the risk of severe illness in the elderly after receiving the new crown vaccine is significantly lower than that of the unvaccinated elderly.

"In addition to social public health interventions, another powerful tool for epidemic prevention and control in China is vaccination." Liang Wannian, head of the expert group of the National Health Commission's leading group for the response to the new crown pneumonia epidemic, said that strict social prevention and control measures in China are buying time windows for vaccination, and large-scale vaccination has also created an important premise for the adjustment of future prevention and control strategies.

Text: Health Daily reporter Yang Jinwei

Editor: Wang Jianying