Key Points

Chikungunya, Dengue, and Zika 

Indigenous Cases 

As of November 9, 2026, 36 outbreaks (+1 new outbreak compared to the previous week) of locally transmitted vector-borne disease have been identified in mainland France: 

• 31 episodes of chikungunya (+1 new episode compared to the previous week), totaling 214 cases (1 to 38 cases per episode) in the Tarn, Lot, and Gard departments (Occitanie), in Gironde, Landes, and Pyrénées-Atlantiques (Nouvelle-Aquitaine), Val-de-Marne, and Seine-Saint-Denis (Île-de-France), Var (Provence-Alpes-Côte d’Azur), and Drôme (Auvergne-Rhône-Alpes);
• 5 dengue outbreaks (no new outbreaks compared to the previous week) totaling 8 cases (1 to 2 cases per outbreak) in the Tarn, the Hérault (Occitanie), the Bouches-du-Rhône, the Var (Provence-Alpes-Côte d'Azur), and the Dordogne (Nouvelle-Aquitaine).

Investigations and prevention and control measures are underway for the various outbreaks that are still active. 

Imported Cases

From May 1, when enhanced surveillance began, through November 8, 2026, the following were identified:

• 168 imported cases of chikungunya
• 507 imported cases of dengue
• 17 imported cases of Zika

West Nile virus infections

Indigenous cases 

• As of November 9, 2026, 222 locally acquired cases of West Nile virus infection (+10 compared to the previous week) have been identified in mainland France. They are located in the Provence-Alpes-Côte d'Azur region (3 departments), Occitanie (7 departments), Île-de-France (7 departments), Auvergne-Rhône-Alpes (5 departments), Nouvelle-Aquitaine (2 departments), Pays de la Loire (4 departments), Centre-Val de Loire (Loiret department), and Corsica (2 departments). For 20 cases, no specific site of infection could be identified. For one of these cases, it could not be determined whether the infection was locally acquired or imported.