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Annual Covid-19 Vaccine Booster Shots Likely Needed
Published on: 2021-04-22
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A leading expert from China's national vaccine development team said that it is possible that people have to receive COVID-19 vaccines annually to boost immunity, but whether it is necessary to do so requires further analysis.
 

Shao Yiming, China's leading physician-scientist and immunologist serving at the Chinese Center for Disease Control and Prevention, said at a press conference on Wednesday that global authorities and vaccine producers have been collecting and analyzing data over the past half year of the application of COVID-19 vaccines.
 

A final analysis of the data will decide whether it is necessary to receive vaccines against the novel coronavirus annually, like flu shots, he said.
 

Shao noted Wednesday that no vaccine can be 100 percent effective, and some recipients will get infected after vaccination. The most important thing is to prevent hospitalization, serious symptoms and deaths, against which most existing COVID-19 vaccines can be more than 80 percent effective.
 

Pfizer Inc. Chief Executive Albert Bourla said it is likely that people who receive Covid-19 vaccines will need booster shots within a year afterward, and then annual vaccinations, to maintain protection against the virus as it evolves.
 

Pfizer and its partner, BioNTech SE, said recently that the shot remains highly effective six months after its second dose, and they hope to provide more information on protection beyond six months in the coming weeks.
 

中国新冠疫苗使用总体时限在半年左右,未来可能需每年加强

4月21日,国务院联防联控机制召开新闻发布会,介绍新冠疫苗接种有关情况。科研攻关组疫苗研发专班专家组成员邵一鸣针对近期外媒报道的加强针相关情况进行了回应。他指出,未来也有可能会像呼吸道传播的其他疾病比如流感一样,每年需要加强,这有待于最后数据的分析。
 

美国接种新冠病毒疫苗的人群中,仍然有5800例感染新冠病毒,74例死亡,某国外疫苗厂商就表示,在接种完成该公司新冠疫苗后的12个月内民众可能再注射一剂加强针。
 

针对这一情况,邵一鸣指出,上述5800例是从7000多万人的接种人群当中产生的,所以总的发生率是小于0.1%的。所以说所有的疫苗都不是百分之百的有效,一定会有些人会感染。另外,疫苗的保护效果是分保护感染、保护疾病和保护传播他人这样一、二、三级的,目前绝大部分疫苗保护感染都是在50%到80%的水平,最重要的是保护住院、重症和死亡,一般都在80%以上,这样并不是说明疫苗的效果不好,它的效果是同样好的。除了临床试验的数据,还有很多真实世界研究的大规模的数据不断出现,说明了疫苗的保护率维持在一个很高的水平。所以还是需要人民更积极地接种疫苗,然后达到群体免疫。
 

关于12个月之后是不是要加强接种,邵一鸣指出,中国现在疫苗使用的总体时限在半年左右,这些数据都在收集和分析的过程当中,各个疫苗厂商,包括各个国家的免疫规划部门都在研究这些数据。按照免疫程序接种后,什么时候需要加强,要根据数据做出科学的决定。所以未来也有可能会像呼吸道传播的其他疾病比如流感一样,每年需要加强,这有待于最后数据的分析。

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