Overview

• Santé publique France has identified 12 autochthonous chikungunya clusters across metropolitan France, totaling thirty cases as of mid-July 2025.
• The Salon-de-Provence cluster is the most extensive with 13 cases, including two in the nearby communes of Grans and Lambesc.
• Public health officials attribute the surge to hundreds of imported infections from recent chikungunya outbreaks in La Réunion and Mayotte.
• High summer temperatures have bolstered tiger mosquito activity, with climate change further expanding the window for transmission.
• A local dengue case confirmed in Auvergne-Rhône-Alpes highlights the concurrent threat of multiple mosquito-borne viruses.