Five local cases of West Nile virus have been detected in Auvergne-Rhône-Alpes, marking the first occurrence in these areas. The epidemic peak has passed, but surveillance continues.
Five cases in Auvergne-Rhône-Alpes
Five autochthonous cases of West Nile virus infection have been identified in the Auvergne-Rhône-Alpes region, with one each in the Rhône, Ain, and Isère departments, and two in the Drôme. This marks the first time the virus has been detected in these areas. Epidemic peak passed
The latest report from Santé publique France shows an epidemic peak around mid-August, followed by a gradual decline. This trend confirms that the peak has now passed, including in the affected region. Mosquitoes spread the virus
The West Nile virus is transmitted by mosquitoes of the Culex genus, which are present throughout France. These mosquitoes are active from May to November, and their role in spreading the virus is a key focus of surveillance efforts. Surveillance and prevention
France’s surveillance system requires the mandatory reporting of confirmed cases. One goal is to reduce the risk of transmission through blood donations and other human-derived products in areas where the virus is circulating. Nationwide case numbers
As of October 12, 178 autochthonous cases of West Nile virus have been recorded nationwide, compared to 62 for the entire year of 2025. Of these, 29 were asymptomatic and found during blood donation screening, while 149 were symptomatic, with 69 presenting a neuroinvasive form. Surveillance continues
Health authorities continue monitoring the situation through November 30, the end of the mosquito activity period. Additional efforts, such as Mions’s new technique for fighting the tiger mosquito, are being explored to manage the spread of disease-carrying insects.
