Brazil results show China’s Sinovac vaccine 50.4% effective

Brazil results show China's Sinovac vaccine 50.4% effective
The Chinese vaccine is one of two that the Brazilian government has lined up. Source: Getty Images
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Daily US Times: China’s Sinovac vaccine has been found to be 50.4% effective in clinical trials in Brazil, according to the latest results released by researchers.

It shows the Sinovac vaccine is significantly less effective than previous data shows – barely over the 50% needed for regulatory approval.

The Sinovac vaccine is one of two that the government of Brazil has lined up. Sinovac is a Beijing-based biopharmaceutical company.

Brazil has been one of the countries worst affected by the coronavirus pandemic.

Sinovac is behind CoronaVac, an inactivated vaccine. It works by using killed viral particles to expose the body’s immune system to the virus without risking a serious disease response.

Several countries, including Singapore, Indonesia, Turkey have placed orders for the vaccine.

Researchers at the Butantan Institute, which has been conducting the trials in Brazil, announced last week that the vaccine had a 78% efficacy against “mild-to-severe” Covid-19 cases.

But on Tuesday they revealed that calculations for this figure did not include data from a group of “very mild infections” among those who received the vaccine that did not require clinical assistance.

Researchers said, with the inclusion of this data, the efficacy rate is now 50.4%.

But Butantan stressed that the Sinovac vaccine is 78% effective in preventing mild cases that needed treatment and 100% effective in staving off moderate to serious cases.

The vaccine trials have yielded different results across different countries.

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