Indonesia has year-round mosquito activity across its tropical archipelago, with peak risk during the rainy season from October through March in most regions. Low-lying coastal areas, urban centers on Java and Bali, and the eastern provinces of Papua carry the highest risk. Altitude and dry-season conditions reduce exposure in some highland areas.
Dengue fever is the primary disease concern, with Indonesia consistently ranking among the highest caseloads globally. Malaria (P. falciparum and P. vivax) is significant in eastern provinces including Papua and Nusa Tenggara, but rare in Bali and Java. Chikungunya, Zika, Japanese encephalitis, and lymphatic filariasis are also present.
Aedes aegypti is the dominant dengue and Zika vector in urban areas, while Anopheles species transmit malaria in rural and forested regions. Culex species are present and linked to Japanese encephalitis, particularly near rice-growing areas.
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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.