Sao Paulo Governor Joao Doria shows the press a box of an experimental COVID-19 vaccine CoronaVac as containers carrying doses of it are unloaded from a cargo plane that arrived from China at Guarulhos International Airport in Guarulhos, near Sao Paulo, Brazil, Thursday, Nov. 19, 2020. The experimental vaccine is being tested in a partnership with the Butantan Institute and Chinese pharmaceutical company Sinovac. (AP Photo/Andre Penner)

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Brazilian study says Sinovac COVID-19 jab 78% effective

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