ctvnews.ca/health/coronavirus/chinese-covid-19-vaccine-far-less-effective-than-initially-claimed-in-brazil-sparking-concerns-1.5264695
A leading Chinese COVID-19 vaccine developed by Sinovac Biotech was just 50.38 per cent 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.
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