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Translation Google Chikungunya, dengue, Zika, and West Nile in mainland France. Enhanced surveillance bulletin of September 24, 2025.
Published on September 24, 2025
Updated on September 24, 2025 PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases
As of September 22, 2025, 76 outbreaks of indigenous vector transmission of chikungunya and dengue fever and a total of 603 cases have been identified in mainland France:
570 cases of chikungunya spread across 65 outbreaks (1 to 103 cases per outbreak; 21 of these outbreaks are closed)
24 cases of dengue fever spread across 11 outbreaks (1 to 5 cases per outbreak; 8 of these outbreaks are closed)
8 isolated cases of chikungunya and 1 isolated case of dengue fever for which the precise location of contamination could not be identified
The indigenous cases are located in the Auvergne-Rhône-Alpes, Corsica, Île de France, Occitanie, Provence-Alpes-Côte d'Azur regions, already affected in previous years, and for the first time this year in Bourgogne-Franche Comté, Centre-Val de Loire, Grand Est and Nouvelle-Aquitaine.Imported cases
993 imported cases of chikungunya
939 imported cases of dengue fever
10 imported cases of Zika
West Nile virus infections
Indigenous cases
As of September 22, 2025, 36 human cases of vector-borne West Nile virus infection have been identified in 11 departments of mainland France. The affected regions are Provence-Alpes-Côte d'Azur, Occitanie, and, for the first time, Île-de-France and Auvergne-Rhône-Alpes.
Translation Google Chikungunya, dengue, Zika, and West Nile in mainland France. Enhanced surveillance bulletin for October 1, 2025.
Published October 1, 2025
Updated October 1, 2025 PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases:
As of September 29, 2025, 80 outbreaks of indigenous vector transmission of chikungunya and dengue fever and a total of 669 cases have been identified in mainland France:
633 cases of chikungunya spread across 69 outbreaks (1 to 115 cases per outbreak; 24 of these outbreaks are closed)
26 cases of dengue fever spread across 11 outbreaks (1 to 7 cases per outbreak; 8 of these outbreaks are closed)
9 isolated cases of chikungunya and 1 isolated case of dengue fever for which the precise location of contamination could not be identified
Imported cases
Since May 1, the start of enhanced surveillance, until September 29, 2025, the following have been identified:
1000 imported cases of chikungunya
960 imported cases of dengue fever
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of September 29, 2025, 41 human cases of vector-borne West Nile virus infection have been identified in 13 departments of mainland France. The affected regions are Provence-Alpes-Côte d'Azur, Occitanie, Nouvelle-Aquitaine, and, for the first time, Île-de-France and Auvergne-Rhône-Alpes.
Translation Google Chikungunya, dengue, Zika, and West Nile in mainland France. Enhanced surveillance bulletin of October 8, 2025.
Published October 8, 2025
Updated October 8, 2025 PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases:
As of October 6, 2025, 87 outbreaks of indigenous vector transmission of chikungunya and dengue fever and a total of 737 cases have been identified in mainland France:
695 cases of chikungunya spread across 75 outbreaks (1 to 128 cases per outbreak; 26 of these outbreaks are closed)
28 cases of dengue fever spread across 12 outbreaks (1 to 8 cases per outbreak; 9 of these outbreaks are closed)
13 isolated cases of chikungunya and 1 isolated case of dengue fever for which the precise location of contamination could not be identified
Imported cases
Since May 1st, the start of enhanced surveillance, until October 6, 2025, the following have been identified:
1007 imported cases of chikungunya
974 imported cases of dengue fever
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of October 6, 2025, 44 human cases of vector-borne West Nile virus infection have been identified in 14 departments of mainland France. The affected regions are Provence-Alpes-Côte d'Azur, Occitanie, Nouvelle-Aquitaine, and, for the first time, Île-de-France and Auvergne-Rhône-Alpes.
Translation Google Chikungunya, dengue, Zika, and West Nile in mainland France. Enhanced surveillance bulletin of October 15, 2025.
Published October 15, 2025
Updated October 15, 2025 PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases:
As of October 13, 2025, 90 outbreaks of indigenous vector transmission of chikungunya and dengue fever and a total of 770 cases have been identified in mainland France:
729 cases of chikungunya spread across 78 outbreaks (1 to 134 cases per outbreak; 33 of these outbreaks are closed)
28 cases of dengue fever spread across 12 outbreaks (1 to 8 cases per outbreak; 9 of these outbreaks are closed)
13 isolated cases of chikungunya for which the precise place of contamination could not be identified
Imported cases
Since May 1, the start of enhanced surveillance, until October 13, 2025, the following have been identified:
1,014 imported cases of chikungunya
987 imported cases of dengue fever
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of October 13, 2025, 48 human cases of vector-borne West Nile virus infection have been identified in 15 departments of mainland France. The affected regions are Provence-Alpes-Côte d'Azur, Occitanie, Nouvelle-Aquitaine, and, for the first time, Île-de-France and Auvergne-Rhône-Alpes.
Translation Google Chikungunya, dengue, Zika, and West Nile in mainland France. Enhanced surveillance bulletin of October 22, 2025.
Published on October 22, 2025
Updated on October 22, 2025 PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases:
As of October 20, 2025, 91 outbreaks of indigenous vector transmission of chikungunya and dengue fever and a total of 795 cases have been identified in mainland France:
749 cases of chikungunya spread across 79 outbreaks (1 to 137 cases per outbreak; 40 of these outbreaks are closed);
29 cases of dengue fever spread across 12 outbreaks (1 to 9 cases per outbreak; 10 of these outbreaks are closed);
17 isolated cases of chikungunya for which the precise location of contamination could not be identified.
Imported cases
Since May 1, the start of enhanced surveillance, until October 20, 2025, the following have been identified:
1,016 imported cases of chikungunya
996 imported cases of dengue fever
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of October 20, 2025, 57 human cases of vector-borne West Nile virus infection have been identified in 17 departments of mainland France. They are located in the Provence-Alpes-Côte d'Azur, Nouvelle-Aquitaine, and Occitanie regions, historically affected by the West Nile virus, and in Île-de-France, Auvergne-Rhône-Alpes, and Normandy, affected for the first time.
In the Occitanie region, the departments of Haute-Garonne and Tarn-et-Garonne are affected for the first time, as well as that of Lot-et-Garonne in Nouvelle Aquitaine.
Chikungunya, dengue, Zika and West Nile in metropolitan France. Enhanced surveillance bulletin of October 29, 2025.
Published on October 29, 2025.
Updated on October 29, 2025. PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases
As of October 27, 2025, 91 clusters of locally acquired vector-borne transmission of chikungunya and dengue and a total of 810 cases have been identified in metropolitan France:
762 cases of chikungunya spread across 79 clusters (1 to 139 cases per cluster; 53 of these clusters are closed);
29 cases of dengue spread across 12 clusters (1 to 9 cases per cluster; 12 of these clusters are closed);
19 isolated cases of chikungunya for which the precise location of contamination could not be identified.
Imported cases
Since May 1st, the start of enhanced surveillance, until October 27th, 2025, the following have been identified:
1,025 imported cases of chikungunya
1,012 imported cases of dengue
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of October 27, 2025, 58 human cases of vector-borne West Nile virus infection had been identified in 17 departments of metropolitan France. These cases were located in the Provence-Alpes-Côte d'Azur, Nouvelle-Aquitaine and Occitanie regions, historically affected by the West Nile virus, and in Île-de-France, Auvergne-Rhône-Alpes and Normandy, affected for the first time.
In the Occitanie region, the departments of Haute-Garonne and Tarn-et-Garonne are affected for the first time, as well as that of Lot-et-Garonne in Nouvelle Aquitaine.
Translation Google Chikungunya, dengue, Zika and West Nile in metropolitan France. Enhanced surveillance bulletin of November 5, 2025.
Published on November 5, 2025.
Updated on November 5, 2025. PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases
As of November 3, 2025, 92 clusters of locally acquired vector-borne transmission of chikungunya and dengue and a total of 818 cases have been identified in mainland France:
770 cases of chikungunya spread across 80 clusters (1 to 139 cases per cluster; 63 of these clusters are closed);
29 cases of dengue spread across 12 clusters (1 to 9 cases per cluster; all clusters are closed);
19 isolated cases of chikungunya for which the precise location of contamination could not be identified.
Imported cases
Since May 1st, the start of enhanced surveillance, until November 3rd, 2025, the following have been identified:
1,035 imported cases of chikungunya
1,028 imported cases of dengue
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of November 3, 2025, 58 human cases of vector-borne West Nile virus infection had been identified in 17 departments of metropolitan France. No new cases were reported during week 45.
The cases are located in the Provence-Alpes-Côte d'Azur, Nouvelle-Aquitaine and Occitanie regions, historically affected by the West Nile virus, and in Île-de-France, Auvergne-Rhône-Alpes and Normandy, affected for the first time.
In the Occitanie region, the departments of Haute-Garonne and Tarn-et-Garonne are affected for the first time, as well as Lot-et-Garonne in Nouvelle Aquitaine.
Translation Google Chikungunya, dengue, Zika and West Nile in metropolitan France. Enhanced surveillance bulletin of November 19, 2025.
Published on November 19, 2025.
Updated on November 19, 2025. PrintShare
Key points
Chikungunya, dengue and Zika
Indigenous cases
As of November 17, 2025, 94 clusters of locally acquired vector-borne transmission of chikungunya and dengue and a total of 833 cases have been identified in metropolitan France:
787 cases of chikungunya spread across 82 clusters (1 to 141 cases per cluster; 73 of these clusters are closed);
29 cases of dengue spread across 12 clusters (1 to 9 cases per cluster; all clusters are closed);
17 isolated cases of chikungunya for which the precise location of contamination could not be identified.
Imported cases
Since May 1st, the start of enhanced surveillance, until November 17th, 2025, the following have been identified:
1,052 imported cases of chikungunya
1,089 imported cases of dengue
11 imported cases of Zika
West Nile virus infections
Indigenous cases
As of November 17, 2025, 59 human cases of vector-borne West Nile virus infection have been identified in 17 departments of metropolitan France.
The cases are located in the Provence-Alpes-Côte d'Azur, Nouvelle-Aquitaine and Occitanie regions, historically affected by the West Nile virus, and in Île-de-France, Auvergne-Rhône-Alpes and Normandy, affected for the first time.
In the Occitanie region, the departments of Haute-Garonne and Tarn-et-Garonne are affected for the first time, as well as Lot-et-Garonne in Nouvelle Aquitaine.
