Dimas Covas (left), director of the Butantan Institute, Jean Gorinchteyn (center), secretary of health of the Sao Paulo state government, and Joao Gabbardo, coordinator of the Contingency Committee against COVID-19, attend a press conference in Sao Paulo, Brazil, on Dec 23, 2020. Brazil's state-run Butantan Institute on Wednesday announced that the CoronaVac vaccine developed by the private Chinese laboratory Sinovac Life Science achieved levels of efficacy against the coronavirus required by the World Health Organization in trials with 13,000 Brazilian volunteers. [Photo/Xinhua]
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