Sierra Leone has year-round mosquito activity with peak risk during the rainy season from May through November. The entire country carries high malaria burden, with the coastal and lowland areas around Freetown and the provinces experiencing intense transmission. The wet, humid climate supports extensive breeding habitat.
Malaria (P. falciparum and P. vivax) is the primary concern and a leading cause of illness and death. Yellow fever is endemic. Lymphatic filariasis is present. Limited healthcare infrastructure makes prevention especially critical.
Anopheles gambiae is the dominant malaria vector. Aedes aegypti transmits yellow fever. The combination of heavy rainfall, tropical humidity, and limited vector control creates one of the highest mosquito-borne disease burdens in the region.
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Explore mosquito risk briefings for other destinations in West Africa.
Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.