Brazilian institute says Chinese CoronaVac vaccine effective

Clinical trials of the CoronaVac coronavirus vaccine developed by Chinese laboratory Sinovac have "reached the efficacy threshold" demanded by the World Health Organization, the Brazilian institute charged with its production and distribution said on Wednesday. However, the Butantan Institute didn't publish the results of those trials -- the last before authorization. The WHO's efficacy threshold is 50 percent but other laboratories, such as Pfizer and BioNTech that are collaborating on a vaccine that has already been administered to thousands of people in the United States and Britain, have reached 90 percent efficacy.

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