久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語Fran?ais
China
Home / China / Health

Booster shots to be on health agenda after herd immunity

Achieving wide coverage the priority, then third jabs in high-risk sectors

By WANG XIAOYU | China Daily | Updated: 2021-08-26 08:49
Share
Share - WeChat
A middle school student receives a COVID-19 vaccination shot in Taiyuan, Shanxi province, on Wednesday. The city recently launched vaccinations for those aged 12 to 14. WU JUNJIE/CHINA NEWS SERVICE

COVID-19 booster shots can be rolled out to high-risk groups in China after enough people are vaccinated to establish herd immunity, domestic vaccine developers said amid mounting evidence that an additional dose can prompt a spike in immune responses.

Zhang Yuntao, vice-president of China National Biotech Group, a subsidiary of State-owned Sinopharm, said the focus at present remains on immunizing all people eligible for vaccines and building herd protection against the virus.

"In the long run, booster shots can be rolled out in China and the priority will include people above 60 years old, as well as workers in the sectors of civil aviation, catering, delivering and other industries that involve employees moving the most frequently across society," he said this week.

The prospect of delivering extra doses to fully vaccinated people has gained urgency recently amid concerns over waning vaccine protection over time and surging infections worldwide driven by the highly contagious Delta variant.

For the company's two-dose inactivated vaccines, Zhang said antibody levels appear to decline about six months after vaccination, the same as vaccines based on other technologies around the globe.

However, injecting an additional shot at least six months after initial inoculations can trigger a large increase in antibody amounts-as high as five to 10 times the previous level, Zhang said, citing preliminary results from an ongoing study in the United Arab Emirates.

An early stage human trial conducted in Henan province also showed that giving a third dose 56 days after the second dose to people aged 3 and above is safe and capable of inducing stronger immune responses compared to people receiving only two doses, Zhang said.

He added that giving booster shots can also enhance protection against the Delta variant because inactivated vaccines have proved effective at tackling emerging variants.

But research into new versions of vaccines designed specifically for dangerous variants is underway. The company adopted the approach of replacing the old strain with the Delta variant and with the Beta variant that was first detected in South Africa and has been linked to higher risk of severe illness and death.

He said the company has completed the research and development phase and is communicating with drug regulators on the next step.

CanSino Biologics, which developed a one-dose vaccine jointly with the Academy of Military Medical Sciences, has found in clinical trials that a booster shot given to vaccinated people six months after initial inoculation can boost antibody levels by eight times.

Zhu Tao, the company's chief scientist, said during an online event this month that some studies show delivering its adenovirus-vectored dose to people vaccinated fully with inactivated vaccines can elicit even more potent protection than people boosted with the same type of vaccine.

Sinovac, another Chinese company, said during a consultation session organized by the World Health Organization this month that injecting a third dose on top of its two-dose regime can lead to a significant increase in overall antibody levels and more comprehensive types of them to fight against the virus.

The WHO said in a statement released on Aug 10 that implementing booster shots risks exacerbating inequalities seen in vaccine distribution worldwide and further straining limited supplies.

It added that there is not enough evidence to support widespread use of booster shots at the moment, and it will keep monitoring the situation and gathering data for further evaluation.

China had administered more than 1.97 billion doses nationwide as of Tuesday, according to the National Health Commission. Health experts have predicted that vaccination coverage will likely reach 80 percent, a critical marker for herd immunity, by the end of this year.

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 亚洲国产成人久久一区二区三区 | 美女图片131亚洲午夜 | 日韩一级精品久久久久 | 国产精品手机在线播放 | 亚洲一区二区三区精品国产 | 免费黄色三级网站 | 色视频一区二区三区 | 毛片视频在线免费观看 | 六月丁香婷婷天天在线 | 亚洲日本va午夜中文字幕 | 欧美做爰免费大片在线观看 | 成人午夜亚洲影视在线观看 | 在线观看亚洲精品专区 | 最全精品自拍视频在线 | 成年人看的黄色片 | 精品三级国产 | 一级一级毛片免费播放 | 中文字幕成人免费高清在线 | 亚洲人成日本在线观看 | 国产精品久久久久久久久久久久 | 日本欧美做爰全免费的视频 | 全部在线播放免费毛片 | 日韩国产免费一区二区三区 | 亚欧精品一区二区三区 | 欧美亚洲国产精品久久久 | 亚洲国产精品91 | 一级毛片免费观看不卡视频 | 国产精品欧美亚洲韩国日本 | 在线精品亚洲欧洲第一页 | 亚洲精品视频免费 | 欧美一级毛片俄罗斯 | 亚洲日本va午夜中文字幕 | 成人精品久久 | 亚洲欧洲日本天天堂在线观看 | 久久国产精品免费看 | 亚洲haose在线观看 | 亚洲精品在线播放 | 中文字幕水野优香在线网在线 | 亚洲视频中文字幕在线观看 | 亚洲美女福利视频在线 | 免费岛国小视频在线观看 |