Brazilian officials said Thursday that a coronavirus vaccine made by a Chinese company was effective, bolstering the chances of approval for a second Chinese inoculation that could be rolled out in much of the developing world.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 …
