West Nile virus

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 France, it is regularly detected in the Mediterranean region.

Our missions

  • Develop and oversee the epidemiological surveillance of West Nile virus infections in humans in mainland France and the overseas departments

  • Contribute to the multidisciplinary surveillance and prevention system covering humans, animals, and entomology

  • Inform healthcare professionals, local authorities, and the general public about mosquito prevention measures

In brief

Videos, infographics, key statistics, expert interviews… Find the latest news and key information about the West Nile virus here

news

Arboviral Diseases in 2026: Mosquito-Borne Diseases Continue to Spread This ...

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In relation to

Chikungunya

thematic dossier

Chikungunya is a viral disease transmitted by mosquitoes of the genus Aedes. The most common symptoms are fever and joint pain.

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Dengue

thematic dossier

Dengue fever is a viral disease transmitted by mosquitoes of the genus Aedes. The most common symptoms are fever and joint pain. Its complications can be severe.

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Zika

thematic dossier

Zika is a viral disease transmitted primarily by mosquitoes but also through sexual contact. Symptoms are usually mild, but the virus can cause birth defects if a woman becomes infected during...

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