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Vaccines said key to reopen intl borders--China Economic Net

  Mass vaccination is the only way for China to build herd immunity against the novel coronavirus and fully reopen to the world, a renowned health expert said.   The National Health Commission said that China had administered nearly 140 million doses as of Sunday, up by about 3.3 million from Saturday. The number of fully vaccinated people in China is still far from the estimated threshold for herd immunity of at least 70 percent.   By comparison, some major economies have outpaced the rest of the world in vaccinating their population, said Zhang Wenhong, head of the infectious disease center at Fudan University s Huashan Hospital in Shanghai.

Quick guide: COVID-19 vaccines in use and how they work

Quick guide: COVID-19 vaccines in use and how they work Nicoletta Lanese © Provided by Live Science gloved hands holding syringe, giving injection into a patient s arm Editor s note: This article was last updated at 9:00am on Feb. 2. The original article was posted on Jan. 11.  Dozens of coronavirus vaccines entered clinical trials during 2020, and now, a handful have been authorized for emergency use in various countries meaning the shots can be administered to the public while their developers continue to collect data on their safety and efficacy. Should they meet all the necessary criteria, these vaccines could be fully approved in the future, and in some places, they already have been.

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