Bhutan has seasonal mosquito activity primarily in the southern lowland districts bordering India, with peak risk during the monsoon from June through September. The subtropical southern belt, including Samtse, Sarpang, and Samdrup Jongkhar, carries the highest risk. Highland areas including Thimphu are largely free of mosquito-borne disease.
Dengue fever has emerged as a concern in the southern districts in recent years, with low-level activity. Malaria (P. vivax) has been nearly eliminated but occasional cases still occur in the southern foothills. The country is working toward malaria elimination.
Aedes aegypti transmits dengue in the lowland border areas. Anopheles species are present in the subtropical south. The limited geographic extent of risk makes Bhutan relatively low-concern for most travelers visiting the highland interior.
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Disease presence data is sourced from WHO, CDC, ECDC, and OpenDengue. This is not medical advice — consult a travel health professional before your trip.