✓ verbatim from the press
The São Paulo State Health Department confirmed on Wednesday, June 17, the 11th yellow fever case in the state in 2026 — a 55-year-old man without vaccination history, residing in Lagoinha, in the Paraíba Valley. With this, the state totals six deaths from the disease this year, five of them concentrated in the Paraíba Valley region, which accounts for 82% of cases. None of the 11 infected people had been vaccinated. ✓
Press quotes (4)
"O paciente é um homem, de 55 anos, sem histórico de vacinação e que vive na cidade de Lagoinha, na região do Vale do Paraíba, que concentra 82% dos casos da doença neste ano."
"Com esse registro, o número de episódios da doença deste ano subiu para 11 e seis mortes foram registradas, das quais cinco foram no Vale do Paraíba."
"Nenhuma dessas pessoas que tiveram confirmação para febre amarela tinha histórico de vacinação."
"De acordo com o CME, da SE de 05 01/02/26 – 07/02/26, compreendendo o monitoramento 2025/2026 de Febre Amarela, foram registrados 40 casos confirmados em primatas não-humanos, sendo a última epizootia confirmada na SE 48/2025 em Itaberaí (GO) e Goiânia (GO). Neste período, não fo"
In 2025, São Paulo confirmed 57 yellow fever cases, with 35 deaths. The Health Department intensified the vaccination recommendation for the entire population, available free of charge at Basic Health Units in all 645 municipalities in the state. "The yellow fever vaccine is safe, effective and available at Basic Health Units in all 645 municipalities in São Paulo," said Tatiana Lang, director of the State Epidemiological Surveillance Center of São Paulo, especially advising those traveling to forest areas or regions with virus circulation. ✓
Press quotes (2)
"Em todo o ano passado, o estado confirmou 57 casos de febre amarela, com 35 óbitos."
"A vacina contra a febre amarela é segura, eficaz e está disponível nas Unidades Básicas de Saúde dos 645 municípios paulistas"
Yellow fever is an acute febrile infectious disease transmitted by the bite of wild mosquitoes Haemagogus and Sabethes, with no direct person-to-person transmission. Symptoms include sudden onset fever, chills, severe headache, back and body pain, nausea, vomiting, fatigue and weakness. In severe cases, patients may present yellowing of skin and eyes, hemorrhage and multiple organ failure, potentially leading to death. ✓
Press quotes (2)
"A infecção pelo vírus causador da febre amarela causa febre de início súbito, calafrios, dor de cabeça intensa, dores nas costas, dores no corpo, náuseas, vômitos, fadiga e fraqueza. Em casos graves, as pessoas podem apresentar pele e olhos amarelados, hemorragia e insuficiência de múltiplos órgãos."
"A febre amarela é uma doença infecciosa febril aguda causada por um vírus, transmitido pela picada de um mosquito silvestre, que vive em zona de mata. Não há transmissão direta de pessoa para pessoa."
The vaccination schedule in force since 2019 recommends: children receive one dose at 9 months and a booster at 4 years; people who received only one dose before 5 years should take a booster; people aged 5 to 59 years who are unvaccinated should receive a single dose; and people vaccinated with a fractional dose in 2018 should verify the need to update their vaccination card. The vaccine must be administered at least 10 days before risk exposure. ✓
Press quotes (1)
"Crianças: uma dose aos 9 meses e reforço aos 4 anos Pessoas que receberam apenas uma dose antes dos 5 anos: devem receber reforço Pessoas de 5 a 59 anos não vacinadas: dose única Pessoas vacinadas com dose fracionada em 2018: devem verificar a necessidade de atualização da caderneta"
The patient confirmed with yellow fever in Lagoinha is a 55-year-old man with no vaccination history
None of the 11 people confirmed with yellow fever in 2026 had a vaccination history
The vaccine must be administered at least 10 days before risk exposure
Covered by only some sources, or where the accounts diverge.
Covered by only some sources (3)
In 2025, São Paulo confirmed 57 yellow fever cases with 35 deaths
Monkey deaths are indicators of the presence of transmitting mosquitoes and should be reported to health teams
The transmitting mosquitoes are of the species Haemagogus and Sabethes
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What is the current yellow fever vaccination coverage in Lagoinha and the Paraíba Valley?
Why it's still unknown: None of the consulted sources published data on the vaccination coverage rate in affected municipalities before the confirmed cases in 2026. The Health Department recommended vaccination but did not disclose the percentage of the immunized population.
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Are there records of recent epizootic events (non-human primate deaths) in the Paraíba Valley signaling intensified viral circulation?
Why it's still unknown: Reports mention that monkey deaths are indicators of the presence of transmitting mosquitoes, but do not report whether epizootics were confirmed in the Paraíba Valley region in 2026. ANVISA Technical Note 3/2026 recorded 40 confirmed epizootics in Brazil until February 2026, but the last ones were in week 48/2025 in Goiás, not in São Paulo.
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Are the 11 confirmed cases in São Paulo in 2026 sylvatic yellow fever or is there evidence of urban transmission?
Why it's still unknown: No source specified whether the cases are autochthonous sylvatic (transmission in forest areas, normal cycle) or if there is a risk of reintroduction of the urban cycle (eradicated in Brazil since 1942). The distinction is critical for assessing epidemiological risk.
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What is the health network's response capacity in terms of available doses and vaccination centers in risk areas?
Why it's still unknown: The Health Department stated that the vaccine is available at all 645 UBSs in the state, but did not disclose how many doses are stocked, whether there is an expanded coverage target, or if vaccination teams in the Paraíba Valley were intensified.