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RIO DE JANEIRO, BRAZIL - A simulation involving 60 million people shows that if everyone wore a mask most of the time, there would be no second or third waves of the coronavirus pandemic. Even in much lower percentages, the spread of Covid-19 would see its reproduction rate (basic reproduction number or R0) drop without the need for more extreme containment measures.

According to the study's authors, in the absence of more technological and advanced . . .

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