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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. 23, 2020. Brazilian researchers said Wednesday the coronavirus vaccine developed by Chinese drug maker Sinovac Biotech was found to be more than 50% effective in a late-stage clinical trial. But officials at the state-run research institute Butantan say they are withholding the results of...
