West Nile Virus in Metropolitan France. 2025 Report.

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Let’s protect ourselves from mosquitoes and the diseases they spread!

As it does every year, mainland France entered an enhanced surveillance period for arboviral diseases on May 1 (which will last until November 30). Faced with the growing threat of...

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Key Points

  • In 2025, during the enhanced surveillance period (May 1 to November 30) 62 autochthonous human cases of West Nile virus infection were identified in six regions of mainland France, including three historically affected by the West Nile virus (Provence-Alpes-Côte d’Azur, Nouvelle-Aquitaine, and Occitanie) and three affected for the first time (Île-de-France, Auvergne-Rhône-Alpes, and Normandy).
  • The detection of human or equine cases every year since 2017 confirms the spread of West Nile virus in mainland France.
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West Nile virus is an arbovirus primarily transmitted by mosquitoes that can cause neurological disorders in humans. It is a virus found in birds, but it can also infect humans and horses. In...

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