Nepal, April 27 -- Climate change makes both the vector and virus carry dengue fever ever higher up Nepal's mountains Nepal is experiencing a worrying spread of dengue fever higher up into Himalayan valleys where the mosquito-borne disease was unknown until a few years ago.

In 2025, 15 of the country's 16 high-altitude districts reported infections, marking an unprecedented ascent of the vector and virus over 2,400m. A Tribhuvan University study has confirmed the presence of Aedes aegypti and Aedes albopictus mosquitoes and their larvae, in Jumla (2,438m).

In Solu Khumbu district, no systematic scientific research has yet been conducted, but dengue cases have been reported in patients without travel history, suggesting the presence of...