Health authorities in Greater São Paulo have expanded the availability of measles vaccines following 15 confirmed cases in the region [1].
This mobilization aims to close immunity gaps and prevent a wider outbreak in one of Brazil's most populous urban areas. The surge in cases has prompted a coordinated response between the Secretaria Estadual de Saúde de São Paulo and the Ministério da Saúde to ensure rapid coverage.
The intensified vaccination campaign began on Monday, June 3, 2026 [2]. The effort is concentrated in three specific municipalities: São Paulo city, Guarulhos, and São Bernardo do Campo [1, 3]. To facilitate access, the campaign utilizes 645 basic health units, known as UBSs [2].
Of the 18 confirmed measles cases reported across Brazil in 2026, 15 are located in São Paulo [1]. While some reports highlighted specific clusters involving three children in the northern zone of the city, the broader regional data indicates a more widespread presence of the virus [1, 4].
There is some variation in the guidance regarding who should seek vaccination. Some health directives focus on children, adolescents, and adults who have not completed their standard immunization schedules [1]. However, other alerts from the region recommend that all people aged six months to 59 years be immunized, regardless of whether they have received previous doses [3].
The MMR vaccine, which protects against measles, mumps, and rubella, remains the primary tool for containment. Health officials said the expansion of the offering is necessary to increase immunisation coverage and prevent further transmission within the community [1, 4].
“15 of the 18 confirmed cases in Brazil are in São Paulo”
The concentration of nearly 83% of Brazil's 2026 measles cases within the Greater São Paulo region suggests a localized outbreak rather than a nationwide surge. By expanding the target demographic to include those previously immunized, health officials are employing a 'ring vaccination' strategy to create a buffer of immunity around the infection clusters, reflecting a high level of urgency to prevent the virus from spreading into other Brazilian states.
