美國Johnson & Johnson公司直接管理疫苗代工廠。
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More than 50 countries have not begun vaccinating, mostly in sub-Saharan Africa. So far only 9% of all adults have received one dose
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2020/11/17 — Both Pfizer and Moderna are testing their separate vaccine candidates that use messenger RNA, or mRNA, to trigger the ... The technology behind mRNA vaccines is thought to be more versatile than traditional methods of vaccine development, ... “In some ways, we're lucky in 2020 that this very powerful technology was ready for prime time, because it could be a really big advantage.”
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Something unexpected happened in South Africa: Covid-19 cases started dropping, without a large-scale vaccination campaign or stringent lockdown. The reason remains somewhat of a mystery.
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There are lots of different ways to make a vaccine, but the ultimate goal of any shot is to introduce the body to the biological equivalent of a “most wanted” poster so that if the real enemy ever shows up, our immune systems know how to fight it off. https://to.pbs.org/39CO8OZ
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