Vietnam experiences peak mosquito activity during the monsoon seasons, which vary by region: May through November in the north, and April through October in the south. Coastal lowlands, the Mekong Delta, and the central highlands are the highest-risk areas, while higher-altitude cities like Da Lat have reduced exposure.
Dengue fever is the leading mosquito-borne disease, with outbreaks concentrated in urban and peri-urban areas during the wet season. Malaria (P. falciparum and P. vivax) remains a concern in forested and highland border regions. Chikungunya, Zika, and Japanese encephalitis are also present.
Aedes aegypti and Aedes albopictus are the primary vectors for dengue and Zika, biting during daylight hours. Anopheles species transmit malaria in rural and forested zones, primarily at night.
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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.