Argentina has highly variable mosquito risk by region. The subtropical north (Misiones, Formosa, Chaco, Salta) has activity from October through May, with peak risk during the wet summer. Buenos Aires experiences seasonal activity but has seen increasing dengue incidence. Patagonia and the south have minimal risk.
Dengue fever is the primary concern, with high-level outbreaks increasingly affecting the north and Buenos Aires. Chikungunya, Zika, yellow fever (in the northeast), West Nile virus, and St. Louis encephalitis are also present. The country has no endemic malaria.
Aedes aegypti is the dominant vector in northern and central urban areas. Aedes albopictus is expanding its range southward. Culex species are associated with West Nile virus and St. Louis encephalitis in temperate zones.
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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.