Chinese COVID-19 vaccine far less effective than initially claimed in Brazil, sparking concerns


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January 13, 2021 A leading Chinese COVID-19 vaccine developed by Sinovac Biotech was just 50.38% effective in late-stage trials in Brazil, significantly lower than earlier results showed, according to a statement published by the government of Sao Paulo Tuesday. While the number exceeds the threshold required for regulatory approval, it falls far below the 78% previously announced , raising questions as to the veracity of the data and fueling skepticism over the apparent lack of transparency regarding Chinese vaccines . Analysts said the efficacy rate of Sinovac’s Coronavac vaccinein Brazil — the lowest among its global competitors —could affect international...