Key Points

• The number of municipalities colonized by the tiger mosquito tripled between 2022 and 2023 (rising from 11 to 32 colonized municipalities).

• 131 imported dengue cases reported during the enhanced surveillance period (May 1 to November 30, 2023).

• 1 imported case of chikungunya reported during the same period.

• No cases of locally transmitted arboviral disease detected in the Pays de la Loire region.