Overview
- A peer‑reviewed modeling study published Wednesday found that climate-driven shifts could make large parts of northeastern North America, central Europe, and East Asia suitable for chikungunya transmission by 2100.
- The study used tens of thousands of geo‑tagged presence records, 16 environmental variables, and 16 IPCC socio‑climate scenarios to map future risk and to quantify uncertainty across pathways.
- Researchers say the Asian tiger mosquito, Aedes albopictus, will drive much of the expansion because it tolerates cooler temperatures and accounted for more than 70% of the modelled virus distribution.
- Current cases remain concentrated in the tropics: the ECDC estimates about 33,000 symptomatic chikungunya cases so far in 2026, mostly in South America, and temperate regions still report only travel‑linked infections.
- Authors urge preparing by about 2040 with mosquito monitoring, clinician training, stronger vector control, and rapid‑response plans to reduce future outbreaks and limit long‑term joint disability in affected people.