Brazil: Significant Yellow Fever Increase in São Paulo State

Seven confirmed cases of Yellow Fever (YF), including 3 deaths have been reported in southeastern São Paulo State since early January 2025, mainly in Socorro. Most of Brazil is endemic for Yellow Fever and all travelers aged ≥ 9 months should receive the YF  vaccination, as well as practice careful insect bite precautions. The mosquitoes that transmit yellow fever bite throughout the day but have peak activity in the early morning, late afternoon, and evening.

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