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. 2025 Aug;30(32):2500545.
doi: 10.2807/1560-7917.ES.2025.30.32.2500545.

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

Lucie Fournier  1 , Guillaume André Durand  2   3 , Amandine Cochet  4 , Elise Brottet  5 , Caroline Fiet  6 , Quiterie Mano  7 , Catarina Krug  1 , Laura Verdurme  8 , Thomas Blanchot  9 , Rémi Fournier  10 ; Investigation team  11 ; Marie-Claire Paty  1 , Gilda Grard  2   3 , Florian Franke  7 , Clémentine Calba  7
Collaborators, Affiliations

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

Lucie Fournier et al. Euro Surveill. 2025 Aug.

Abstract

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.

Keywords: France; aedes albopictus; arbovirus; autochthonous transmission; chikungunya.

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Conflict of interest statement

Conflict of interest: None declared.

Figures

The figure presents the number of imported cases of chikungunya in Mainland France between 2006 and 2025 (up to mid-July).
Figure 1
Number of imported cases of chikungunya, Mainland France, 2006–10 July 2025 (n = 3,671)
The figure presents the symptom onset for the first autochthonous cases of dengue, chikungunya and Zika in Mainland France between 2010 and mid-July 2025.
Figure 2
Week of symptom onset for the first autochthonous cases of dengue virus, chikungunya virus and Zika virus of a local transmission event, Mainland France, 2010–10 July 2025 (n = 53)a
The map presents the residence of cases included in autochthonous transmission events of chikungunya virus infections in Mainland France between May and mid-July 2025.
Figure 3
Map of the autochthonous transmission events of chikungunya virus, Mainland France, May–10 July 2025 (n = 27)
See this image and copyright information in PMC

References

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