Brazil trial will soon be heating up. The Chine
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The Chinese vaccines Sinopharm and Sinovac — which make up almost half of all shots delivered globally — offer almost zero protection from Omicron infection. The great majority of people in China have received these shots, which are also widely used in low-and middle-income countries such as Mexico and Brazil.
https://www.nytimes.com/live/2021/12/20/world...cine-tests