Brazil has year-round mosquito activity in the tropical north and northeast, with seasonal peaks during the rainy season from November through May. The Amazon basin, the northeast, and major urban centers like Rio de Janeiro, Sao Paulo, and Salvador carry the highest dengue burden. The Amazon region carries additional malaria and yellow fever risk.
Dengue fever is the primary concern, with Brazil consistently reporting among the highest global caseloads. Malaria (P. falciparum and P. vivax) is concentrated in the Amazon region. Yellow fever circulates in sylvatic cycles and periodic outbreaks reach urban fringes. Chikungunya, Zika, lymphatic filariasis, and St. Louis encephalitis are also present.
Aedes aegypti is the dominant urban vector for dengue, Zika, and chikungunya. Anopheles darlingi is the primary malaria vector in the Amazon. Haemagogus and Sabethes species transmit sylvatic yellow fever in forested areas.
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Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.