Chikungunya, Dengue, Zika, and West Nile Virus in mainland France. Enhanced Surveillance Bulletin of July 16, 2026.

Published on 16 July 2026

Key Points

Chikungunya, Dengue, and Zika

Indigenous Cases

No locally acquired cases have been identified in mainland France.

Imported cases

From May 1, when enhanced surveillance began, through July 12, 2026, the following cases were identified:

69 imported cases of chikungunya
215 imported cases of dengue
9 imported cases of Zika

West Nile virus infections

Autochthonous cases

As of July 16, 2026, one locally acquired case of West Nile virus infection was identified in the Pyrénées-Orientales (Occitanie). This is the first detection of the virus circulating in humans in France in 2026.

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Dengue

thematic dossier

16 July 2026

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.

Chikungunya

thematic dossier

16 July 2026

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

West Nile virus

thematic dossier

16 July 2026

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...