RIO DE JANEIRO, Brazil (AFP) — Hard-hit Brazil’s drive to vaccinate its population against Covid-19 has stumbled this week as a lack of doses forced authorities to slow or halt immunization in several key areas. Rio de Janeiro, Sao Paulo state and the northeastern city of Salvador have all run into vaccine shortages, fueling frustration with the government, which already faced criticism for President Jair Bolsonaro’s erratic handling of the pandemic. Brazil got its immunization […]