Brazilian Researchers Say Chinese-Made COVID-19 Vaccine is Effective By VOA News December 24, 2020 09:54 AM Share on Facebook Share via Email Print this page Dimas Tadeu Covas, director of the Butantan Institute, speaks during a press conference regarding the Sinovac COVID-19 vaccines test results, at headquarters of the Butantan Institute in Sao Paulo, Brazil, Dec.…

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