Officials in the state of São Paulo, where a prominent medical research institute carried out a large study of the vaccine made by the Beijing-based Sinovac, said the inoculation had an efficacy rate of 78 percent.
The vaccine prevented all participants from developing serious and mild complications from the virus, officials said, calling it a highly effective preventive tool.
In anticipation of approval, the vaccine, called CoronaVac, has already been shipped around the world as countries…
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