RIO DE JANEIRO, BRAZIL - The novel coronavirus had been in circulation for at least 20 days in Brazil when crowds took to the streets in major cities to celebrate Carnaval, according to a study released on Monday, May 11th, by the Oswaldo Cruz Institute (IOC/Fiocruz).
The study shows that the Sars-CoV-2 virus began to spread in the country in the first week of February, more than 20 days before the first case was officially diagnosed in a traveler who returned from Italy to São Paulo.
The case was detected on February 26th, Ash Wednesday, almost 40 . . .
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