Tonga has year-round mosquito activity, with peak risk during the warm, wet season from November through April. The main island of Tongatapu and the Vavau group carry the highest exposure due to population density.
Dengue fever is the primary concern, with moderate activity and periodic outbreaks. Zika has also caused outbreaks. Lymphatic filariasis is present. Tonga has no malaria transmission.
Aedes aegypti is the primary vector. The tropical Pacific climate supports year-round mosquito breeding, with the wet season significantly amplifying populations.
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Explore mosquito risk briefings for other destinations in Oceania.
Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.