French Guiana has year-round mosquito activity in its equatorial climate, with peak risk during the rainy season from January through June. The interior rainforest, the Maroni River border region, and the coastal areas including Cayenne carry the highest risk.
Dengue fever is a concern at moderate levels. Yellow fever is present in the forested interior, and vaccination is required for entry. Malaria (P. falciparum and P. vivax) persists in the interior, particularly along the rivers and in gold-mining areas.
Aedes aegypti transmits dengue in urban coastal areas. Anopheles darlingi is the primary malaria vector in the forested interior. Haemagogus and Sabethes species transmit sylvatic yellow fever in the rainforest canopy.
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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.