Ministry of Health restores second polio booster dose at 4 years, reversing 2024 decision

Between 1968 and 1989 Brazil recorded more than 26,000 polio infections

The oral vaccine was discontinued because the attenuated virus can, in rare situations, mutate and cause the disease

Isabela Ballalai states that localized international outbreaks increase the risk of virus arrival in Brazil and justify maintaining two boosters according to WHO standard