Read MoreBrazil struggles to control coronavirus surge, while new COVID vaccine Novavax shows 89 percent efficacy.Brazil struggles to control coronavirus surge, while new COVID vaccine Novavax shows 89 percent efficacy.
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Read MoreBrazil struggles to control coronavirus surge, while new COVID vaccine Novavax shows 89 percent efficacy.Brazil struggles to control coronavirus surge, while new COVID vaccine Novavax shows 89 percent efficacy.