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São Paulo — Brazil officials said on Tuesday the Coronavac vaccine developed in partnership with China's Sinovac Biotech was 50.38% effective in preventing coronavirus cases, a number that meets the threshold required by global regulators for approval but that’s well below the 78% figure announced last week.

At a press conference Tuesday, São Paulo state officials and researchers from Butantan Institute explained that they split the cases in six categories: asymptomatic, very mild, mild, two levels of moderate, and severe — the first two not requiring medical assistance...

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