A nationwide multivaccination campaign began across Brazil on Monday, 3 August, seeking to reverse declining immunisation coverage among children and adolescents. The Ministry of Health-coordinated effort will run until 1 September, with a national mobilisation day set for 22 August. Unlike single-disease campaigns, the strategy deploys the full National Vaccination Calendar to identify and fill gaps in individual records during a single visit, targeting all under-15s whose doses are incomplete.

In the state of São Paulo, the campaign carries an additional urgency. The state health secretariat confirmed 15 measles cases this year—12 in the capital, two in São Bernardo do Campo, and one in Guarulhos—prompting the Ministry of Health to recommend that these three cities temporarily offer the measles, mumps, and rubella (MMR) vaccine to the entire population aged six months to 59 years, regardless of prior immunisation status. State-level data show first-dose MMR coverage at 77.5% and second-dose at 65.5%, well below the 95% target. The most recent case, a young child in Guarulhos with no vaccination history, underscores the risk of reintroduction in a country that regained its measles-free certification only in 2024.

Across the country, the campaign makes available vaccines against polio, rotavirus, hepatitis A and B, meningitis, yellow fever, HPV, influenza, and Covid-19, among others. In Manaus, where polio coverage for infants under one year stands at 94.24%, community health agents will conduct active searches for children with incomplete schedules. Belo Horizonte, with polio coverage at 88.7%, is simultaneously introducing a second booster dose of the inactivated polio vaccine for four-year-olds. In the Federal District, health teams will consult digital records to reconstruct vaccination histories for families who have lost their paper booklets.

The immediate operational milestone is the 22 August D-Day, when health units and community points in all participating municipalities will intensify immunisation activities. The campaign’s effectiveness will be measured by the number of cadernetas reviewed and doses administered by the 1 September close, with state and municipal health departments responsible for micro-planning to reach children who have fallen behind.