Multiple early local transmissions of chikungunya virus, Mainland France, from May 2025

Published on 14 August 2025 Updated on 8 September 2025

In 2025, a large outbreak of chikungunya occurred in Réunion Island (France). By 10 July, 1,911 imported cases were notified in Mainland France, most (89%) were associated with travel to Réunion Island. Ten autochthonous outbreaks in five French regions involving 27 cases were identified between May and mid-July and outbreaks occurred earlier than in previous years. Aedes albopictus, the mosquito vector, is endemic in large parts of France. Transmission events early in the vector active season is concerning.

Author(s): Fournier Lucie, Durand Guillaume André, Cochet Amandine, Brottet Elise, Fiet Caroline, Mano Quiterie, Krug Catarina, Verdurme Laura, Blanchot Thomas, Fournier Rémi, Paty Marie-Claire, Grard Gilda, Franke Florian, Calba Clémentine

Publishing year: 2025

Pages: 2-7