Santé publique France has identified several new cases of local contamination of chikungunya, dengue, and West Nile virus in southern France.
In the Occitanie region of France, two new episodes of chikungunya transmission were identified.
Authorities stated that the progression of the tiger mosquito has been favored by globalization, urbanization, and global warming.
The tiger mosquito is established in 83 metropolitan departments in France and remains active from May to November.
Transmission data and virus counts
A total of five episodes of autochthonous transmission linked to the tiger mosquito have been recorded in France.
These five episodes include three episodes of chikungunya, involving seven cases in Tarn and Gironde, and two episodes of dengue, with one case in Tarn and one in Hérault.
The first local chikungunya contamination in metropolitan France was announced one week prior to the current report.
In Bouches-du-Rhône, France, two new autochthonous cases of West Nile virus were detected.
The total number of local West Nile virus contaminations has reached four, including one case in Pyrénées-Orientales.
Until recently, recorded cases of these viruses were only among people returning from areas where the viruses circulate.
In 2025, metropolitan France recorded more than 800 autochthonous cases of chikungunya, 29 cases of dengue, and 62 cases of West Nile fever across 17 metropolitan departments.
The French Ministry of Health sent a call for reinforced vigilance to health professionals regarding arboviruses in late May.
