Overview

• Health authorities report about 480 autochthonous chikungunya cases as of September 15, up from 382 a week earlier.
• Multiple clusters now total more than 20 to over 50 cases, notably in Fréjus, Antibes and Bergerac, with some secondary chains identified.
• A first locally acquired case was confirmed in the Loiret near Orléans, prompting ARS-led demoustication and door‑to‑door investigations.
• Targeted control uses 300‑metre treatment zones with repeated night spraying; officials stress case counts likely understate true infections and urge personal protection.
• Aedes albopictus is established in 81 departments, while 21 local dengue cases and 32 West Nile infections remain under reinforced surveillance.