Laos has a distinct wet season from May through October when mosquito activity peaks sharply. The Mekong River valley, forested border areas, and lowland provinces carry the highest risk. Higher-altitude areas and Vientiane city center have somewhat lower exposure.
Dengue fever is the primary concern, with outbreaks concentrated in the rainy season. Malaria (P. falciparum and P. vivax) persists in southern forested provinces and border areas. Chikungunya and Japanese encephalitis are also present.
Aedes aegypti and Aedes albopictus transmit dengue during the day in urban and suburban settings. Anopheles species carry malaria in rural and forested zones, biting predominantly at night.
As an Amazon Associate, Mozzwise earns from qualifying purchases. Paid links.
Explore mosquito risk briefings for other destinations in Southeast Asia.
Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.