RIO DE JANEIRO, BRAZIL - (REUTERS) Brazilians should prepare for annual Covid-19 immunizations to reinforce vaccines currently available, the head of public-sector laboratory Butantan said on Thursday.
Annual boosters would add to the burden for Brazil’s shaky national vaccination program, which has struggled to speed up immunizations to confront the world’s most deadly coronavirus outbreak.
Just a quarter of adults in Brazil have received their first shot against Covid-19 — and only one in eight have had a second.
Dimas Covas, director of the Butantan Institute in São Paulo, which has partnered on production of a . . .