Uruguay has seasonal mosquito activity from October through April, with peak risk during the warm, humid summer months of December through March. The northern departments bordering Brazil (Artigas, Rivera, Salto) carry the highest risk. Montevideo and the southern coast have lower exposure.
Dengue fever has been reported at low levels, with most cases imported or linked to cross-border transmission from Brazil. Western equine encephalitis is present. Uruguay has no malaria or yellow fever transmission. Overall mosquito-borne disease risk is among the lowest in South America.
Aedes aegypti has been detected in northern departments near the Brazilian border. The temperate climate limits year-round mosquito activity, making Uruguay relatively low-risk compared to its tropical neighbors.
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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.