Sinovac — one of a handful around the world that are entering late-stage testing to prove effectiveness.Dimas Covas, president of the Butantan Institute coordinating the study, said at a press conference that if the vaccine proves safe and effective, Brazil would receive 120 million doses from China at the beginning of next year, which will allow 30 million Brazilians to be vaccinated.It's one of nearly two dozen potential vaccines that are in various stages of human testing worldwide.Brazil's soaring COVID-19 outbreak makes it useful for testing whether a potential vaccine works in widespread presence of the new coronavirus.The federal Ministry of Health said Monday that Brazil has now recorded more than 2 million confirmed cases of.