Tiger mosquito spreads in France

The tiger mosquito, aedes albopictus, has been in France since 2004 and is now expanding into major urban areas in the Centre-Val de Loire region. Its presence raises concerns about the spread of diseases such as chikungunya, dengue, and zika.

Mosquitoes need specific conditions to thrive

Yseult de Dreuille, a medical entomologist, explains that tiger mosquitoes prefer temperatures between 18°C and 30°C and require humid surfaces for laying eggs, stagnant water for larvae, shaded resting spots, and hosts for blood meals. These conditions are commonly found in urban environments.

Mosquito monitoring period extended

Due to the increasing presence of the tiger mosquito, the mosquito monitoring period in France has been extended from May 1st to November 30th. In the Centre-Val de Loire region, 40% more communes were colonized in 2025 compared to previous years, with nearly half the population at risk of arbovirus transmission.

Preventing stagnant water is key

Public health officials emphasize the importance of eliminating stagnant water in urban areas. Measures include avoiding raised terraces, using leaf guards on gutters, emptying watering cans, and covering water collection tanks. Urban furniture that can hold water should also be avoided.

Community and city planning must act together

Yseult de Dreuille highlights the need for collective action, as tiger mosquitoes can travel up to 200 meters. Cities are encouraged to integrate mosquito prevention into urban planning and real estate guidelines. Some local legislation may be necessary to prevent outbreaks similar to those on La Réunion Island.

Surveillance and control methods are being tested

Professionals and local governments can use mosquito surveillance networks and traps to monitor and control populations. Techniques like the Sterile Insect Technique, currently tested in Toulouse, have shown success in reducing mosquito numbers. However, eradication is unlikely, and the tiger mosquito population is expected to grow in the coming years.