Climate Change Could Spread Chikungunya Risk to Temperate Regions by 2100

A new study warns that climate change could expand the geographic range of chikungunya into parts of North America, Europe and East Asia by the end of this century as rising temperatures allow Aedes mosquitoes to survive in previously inhospitable zones. Researchers have identified north-eastern North America, central Europe and East Asia as emerging risk zones requiring early preparedness action.

Chikungunya is currently concentrated in tropical and subtropical regions where the Aedes aegypti and Aedes albopictus mosquito vectors are established. The new study finds that warming temperatures could allow sustained mosquito transmission in areas previously too cold to support year-round mosquito populations. Researchers conclude that without proactive public-health investment, countries in temperate zones face a growing disease burden for which their health systems are currently unprepared.

The findings have direct relevance for India, which is already one of the countries most affected by chikungunya and dengue. India's experience shows that rapid urban expansion, poor drainage infrastructure and monsoon flooding amplify vector populations in ways that climate change will worsen. As temperatures rise and extreme rainfall events become more frequent, transmission seasons are expected to lengthen and mosquito habitat to spread into higher-altitude zones such as parts of the Himalayan foothills.

The study recommends that countries in temperate regions strengthen mosquito surveillance and clinical diagnostic capacity before 2040, when risk is expected to materialise more acutely. Investment in vector-control infrastructure and vaccine development is also urged. For India, the study supports calls for integrated climate-health planning that treats vector-borne disease expansion as a predictable and manageable consequence of climate change rather than an unpredictable natural event.

Key figure — Preparedness action required before 2040