[REVISION HISTORY]

Brazil health response expands amid measles and West Nile

Updated 25 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-11 00:22 UTC → 2026-09-12 16:22 UTC · added ~~removed~~

Following the Pan American Health Organization’s warning of a Southern‑Hemisphere respiratory virus surge, Brazil’s health authorities intensified surveillance and vaccination efforts throughout the 2026 winter. Early measures included the rollout of the 20‑valent pneumococcal vaccine (Pneumo 20), seasonal influenza shots, a maternal RSV vaccine, and nirsevimab for infants. Data from the first half of 2026 show that the universal health system (SUS) achieved roughly 90% coverage of the maternal RSV vaccine, reducing severe acute respiratory syndrome (SRAG) hospitalisations in infants under six months by 52%. In August 2026, focus shifted toward a measles resurgence. The Ministry of Health launched the 2026 National Multivaccination Campaign on 3 August, which has since concluded after administering over 8 million doses nationwide. By the end of August, the state of São Paulo reported 28 confirmed measles cases for the year, with 25 cases concentrated in the metropolitan region. Notably, 20 of these patients had no record of prior vaccination. By early September, the measles situation expanded. In São Paulo, the annual confirmed case count rose to ~~30, including two recent~~ 32, with 29 cases ~~in children under two years old~~ located in the ~~capital. Of these 30 patients, 22 had~~ capital and others in Guarulhos and São Bernardo do Campo. Among these, health officials noted cases involving an infant with an incomplete ~~or no~~ vaccination ~~records. In response, Campinas reported~~ schedule and a ~~94% increase in measles vaccinations during August.~~ 28-year-old who had previously been vaccinated. In the Amazonas state, three ~~measles~~ imported cases involving Peruvian nationals from Alto Monte were confirmed in the border municipality of ~~Tabatinga, prompting reinforced surveillance in~~ Tabatinga. In response, the ~~Alto Solimões region due~~ Manaus Municipal Health Secretariat issued an epidemiological alert to ~~high cross-border movement.~~ prevent local circulation, noting that Manaus has not seen an autochthonous case since 2018. The Ministry of Health ~~officials continue~~ plans to ~~urge the population~~ deploy support teams to ~~verify immunization schedules, particularly for children due at 12~~ Tabatinga and ~~15 months. Other regional efforts included Porto Alegre, which applied nearly 79,000 doses,~~ Carauari on 21 September to investigate cases and ~~Rio Branco, which administered over 13,000. Additionally,~~ implement vaccine blocking. This follows broader outbreaks across the ~~state of São Paulo~~ Americas, where the Pan American Health Organization reports nearly 48,000 confirmed ~~its first two human~~ cases ~~of West Nile Fever.~~ and 44 deaths.

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