It was also 96% effective at preventing hospitalization, Indonesian officials said. Sinovac's COVID-19 vaccine was an estimated 98% effective at preventing death in Indonesian health workers. The efficacy data of about 50% is for very mild disease, requiring no treatment. A coronavirus vaccine developed by China's Sinovac has been found to be 50.4% effective in Brazilian clinical trials, according to the latest results released by researchers. An analysis of Indonesian health-care workers inoculated with a COVID-19 vaccine developed by China's Sinovac Biotech showed it was 98 percent effective at preventing death and 96 percent effective at preventing hospitalization, a health ministry official said. HOW EFFECTIVE IS THE SINOVAC VACCINE REALLY? 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 … Russell: The Sinovac study was to look at how the vaccine works against the entire range of clinical symptoms, from mild infections to severe ones, including death. Sinovac began work on a Covid-19 vaccine soon after a top Chinese epidemiologist disclosed on national television in late January that the coronavirus in Wuhan was being transmitted between humans. Researchers at Brazil’s Butantan Institute in Sao Paolo have announced that trials of the CoronaVac vaccine — made by the Chinese company Sinovac — show it is just over 50 percent effective overall, once very mild cases of the disease are taken into account, which is barely over the threshold needed for regulatory approval.. Last week the Institute reported the vaccine was 78 …

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