Dengue/Severe dengue frequently asked questions
Where does the disease occur?
Dengue is mainly transmitted by a mosquito (Aedes aegypti) and is distributed across all tropical countries (map available). Ae. aegypti and other species such as Ae. albopictus are highly adaptive and their combined distribution can spread dengue higher up north across Europe or North America during summer. (Note: Travellers already infected with the virus also spread the disease when they get bitten by the local Aedes mosquito population).
Dengue outbreaks can occur anytime, as long as the mosquitoes are still active. However, in general, high humidity and temperature are conditions that favour mosquito survival, increasing the likelihood of transmission.