RIO DE JANEIRO, BRAZIL - Considering the local production capacity of vaccines and the contracts already signed with pharmaceutical companies worldwide, Brazil should achieve herd immunity against Covid-19 in October this year, two months after the United States and almost at the same time as Japan and the European Union. In the South American continent, herd immunity should be reached only in March 2022.
A controversial term in the first months of the pandemic, herd immunity occurs when a large part of a population has already been vaccinated and developed antibodies against a virus, thereby reducing its potential for transmission . . .