Malaysia has year-round mosquito activity in its tropical climate, with peak risk during the monsoon seasons: the northeast monsoon from November to March on the east coast, and the southwest monsoon from May to September on the west coast. Urban areas including Kuala Lumpur, Penang, and Johor are high-risk for dengue, while Malaysian Borneo (Sabah and Sarawak) has additional malaria exposure.
Dengue fever is the primary concern, with Malaysia reporting significant outbreaks annually in urban and peri-urban areas. Malaria (P. vivax), including knowlesi malaria from primate reservoirs, is a risk in forested parts of Sabah and Sarawak. Chikungunya, Zika, and Japanese encephalitis are also present.
Aedes aegypti is the dominant urban vector, while Aedes albopictus is widespread in suburban and semi-rural environments. Anopheles species carry malaria in forested Borneo, biting 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.