Tiger mosquito expansion increases dengue risk in France

The tiger mosquito is expanding rapidly across France, moving from presence in only one department in 2004 to 81 departments by 2025. This expansion increases the risk of local transmission of arboviruses such as dengue, chikungunya, and Zika.

A study published in Global Change Biology by researchers from the Institut de Recherche pour le Développement (IRD), Cirad, and the Abdus Salam International Centre for Theoretical Physics models the impact of climate change and demographic dynamics on this spread. The findings suggest that over 99% of future changes in the mosquito's distribution and transmission risk will be attributable to climate change, while demographic shifts will play a negligible role.

Local authorities, such as those in Decize, emphasize that eliminating standing water is the most effective way to prevent proliferation, as 80% of breeding sites are man-made. Recommendations for residents include emptying flowerpot saucers, covering water tanks, and ensuring proper drainage to limit larval development.