correction
A previous version of this article misstated the number of Brazilians who have received coronavirus vaccines. More than 35 million Brazilians have received at least one shot. The article has been corrected.
ANGRA DOS REIS, Brazil — After a lifetime of feeling invisible, the family was told they’d suddenly become one of Brazil’s top priorities. As the country began rolling out coronavirus vaccines early this year, officials said communities like theirs, founded by Africans who escaped slavery, would be among the first to receive shots.