Europe disease surveillance
Chikungunya in Europe, 2025-2026 case data
In 2025, Italy reported the most Chikungunya cases of any EU/EEA country, 384 autochthonous cases, ahead of France (809). No autochthonous human Chikungunya cases are reported in the tracked countries so far in 2026. Figures cover the countries Mosticare tracks (updated 20 July 2026); ECDC publishes the full EU/EEA total.
Last updated · 20 July 2026 · CC BY 4.0
Key facts
France had the largest autochthonous chikungunya outbreak in continental Europe in 2025, 809 locally-acquired cases across 79 transmission episodes (1 May, 30 November), with symptom onset between 27 May and 13 November. It was the largest continental-European autochthonous CHIKV outbreak on record for that year.
Source: Santé publique France · enhanced arbovirus surveillance · verified 25 May 2026
Italy reported 384 autochthonous (locally-acquired) chikungunya cases in 2025 across four regions, Emilia-Romagna, Veneto, Toscana and Lazio, out of 472 total cases including travel-imported ones, with no deaths. All Italian and French CHIKV clusters were declared closed by the end of 2025.
Source: Istituto Superiore di Sanità (ISS) · verified 31 May 2026
French Guiana (ISO-3166-1 alpha-2 GF, French overseas territory in South America) is reporting the largest active chikungunya cluster in French overseas territories in 2026, with 1,057 cumulative biologically-confirmed cases through Santé publique France Direction régionale Guyane's semaine 27 bulletin (week 29 Jun to 5 Jul 2026, published 9 Jul 2026), the S27 weekly count 44 (données non consolidées). Cumulative hospitalisations reached 201 across the three CHU de Guyane sites (majority classic form, with 21 unusual forms and 8 severe forms); 1 death classified by SpF as unrelated to chikungunya. Under the ORSEC arboviroses plan the Littoral Ouest and Savanes remain the most active foyers, the Île de Cayenne has seven foyers under surveillance and the Maroni is in sporadic transmission. The cluster is the largest sustained autochthonous chikungunya transmission reported from an EU-outermost-region in 2026 and the most material French-overseas escalation point in the 2026 chikungunya arc. Vector: Aedes aegypti (yellow-fever mosquito) is the dominant GF chikungunya vector (Aedes albopictus is also established in GF but is not the principal outbreak vector here). The cluster is intentionally NOT folded into the metropolitan FR/CHIKV 2026 row (which covers metropolitan France only), the territory-scope decision recorded in MOS-2831 selected Option B (separate FR-GF record) over Option A (extend FR national row), preserving the metropolitan vs overseas scope separation that SpF's separate-bulletin practice operationalises.
Source: Santé publique France, Direction régionale Guyane (SpF-Guyane weekly Bulletin régional Guyane: Surveillance épidémiologique du chikungunya, semaine 27, published 9 Jul 2026) · verified 27 July 2026
Chikungunya in Europe over time (2007-2025)
Autochthonous (locally-acquired) chikungunya in the EU/EEA is episodic, not a steady year-on-year trend: occasional, self-limiting summer clusters spread by the Aedes albopictus tiger mosquito, with most years since the first European outbreak in 2007 reporting no local cases at all. EU/EEA Member States have recorded autochthonous chikungunya in only 6 years between 2007 and 2025, 2007 (330), 2010 (2), 2014 (12), 2017 (303), 2024 (1) and 2025 (1,172) cases, with 2025 by far the largest on record (1,172). The two most recent seasons (2024: 1, then 2025: 1,172) show local transmission reaching larger clusters and further north, best read as rising risk of episodic outbreaks rather than a clean upward trend. Figures are reported locally-acquired (autochthonous) human chikungunya cases in EU/EEA Member States (mainland) per ECDC. Chikungunya transmission in Europe is episodic: self-limiting Aedes albopictus clusters that open and close rather than a continuous yearly burden, so most years since 2007 have had zero autochthonous EU/EEA cases and the series is intentionally gappy. Year-to-year comparisons are affected by changes in surveillance intensity, case definitions and vector spread, and any single warm season can produce an outsized cluster. Counts here exclude travel-imported cases and exclude EU outermost regions (e.g. Réunion and Mayotte), which ECDC reports separately and where 2025 case numbers were far larger. ECDC is the primary surveillance authority for the complete European total.
| Year | EU/EEA cases | Deaths | Source |
|---|---|---|---|
| 2007 | 330 | , | ECDC · Historical data on local transmission of chikungunya virus disease in the EU/EEA |
| 2010 | 2 | , | ECDC · Historical data on local transmission of chikungunya virus disease in the EU/EEA |
| 2014 | 12 | , | ECDC · Historical data on local transmission of chikungunya virus disease in the EU/EEA |
| 2017 | 303 | , | ECDC · Annual Epidemiological Report for 2017, Chikungunya virus disease |
| 2024 | 1 | , | ECDC · Communicable Disease Threats Report, week 47 2024 |
| 2025 | 1,172 † | , | ECDC · Communicable Disease Threats Report, week 49 2025 (final end-of-season, data to 3 December 2025) |
The data
| Country / region | Disease | Cases | Deaths | Period | Source | Updated |
|---|---|---|---|---|---|---|
| French Guiana | Chikungunyasurveillance · 2 French Guiana sectors that remain the most active chikungunya foyers under the ORSEC arboviroses plan (Littoral Ouest + Savanes) | 1,057 | 1 | 2026 transmission season (cumulative since S04 outbreak onset, through S27 / 29 Jun to 5 Jul 2026) | Santé publique France, Direction régionale Guyane (SpF-Guyane weekly Bulletin régional Guyane: Surveillance épidémiologique du chikungunya, semaine 27, published 9 Jul 2026) | 20 July 2026 |
| France | Chikungunya | 0 | 0 | 2026 enhanced-surveillance period (1 May, 30 November) | Santé publique France · enhanced arbovirus surveillance | 31 May 2026 |
| Italy | Chikungunya | 0 | 0 | 2026 transmission season (year-to-date) | Istituto Superiore di Sanità (ISS) | 31 May 2026 |
| France | Chikungunya | 809 | , | 2025 enhanced-surveillance period (1 May, 30 November) | Santé publique France, bilan national chikungunya/dengue/Zika 2025 (édition nationale, enhanced arbovirus surveillance) | 15 June 2026 |
| Italy | Chikungunya | 384 | 0 | 2025 transmission season | Istituto Superiore di Sanità (ISS) | 31 May 2026 |
About Chikungunya
Chikungunya is an arbovirus transmitted in Europe by the Asian tiger mosquito, Aedes albopictus, an aggressive daytime biter that has expanded steadily northward since 2005. Autochthonous (locally-acquired) outbreaks in continental Europe are clustered, episodic, and concentrated in the Mediterranean rim, though 2025 saw transmission reach further north in France than ever before. Enhanced arbovirus surveillance typically runs from 1 May to 30 November.
Frequently asked questions
What was the largest chikungunya outbreak in Europe in 2025?
France had the largest autochthonous chikungunya outbreak in continental Europe in 2025, 809 locally-acquired cases across 79 transmission episodes (1 May, 30 November), with symptom onset between 27 May and 13 November. It was the largest continental-European autochthonous CHIKV outbreak on record for that year.
How many autochthonous chikungunya cases did Italy report in 2025?
Italy reported 384 autochthonous (locally-acquired) chikungunya cases in 2025 across four regions, Emilia-Romagna, Veneto, Toscana and Lazio, out of 472 total cases including travel-imported ones, with no deaths. All Italian and French CHIKV clusters were declared closed by the end of 2025.
What is the largest active chikungunya cluster in French overseas territories in 2026?
French Guiana (ISO-3166-1 alpha-2 GF, French overseas territory in South America) is reporting the largest active chikungunya cluster in French overseas territories in 2026, with 1,057 cumulative biologically-confirmed cases through Santé publique France Direction régionale Guyane's semaine 27 bulletin (week 29 Jun to 5 Jul 2026, published 9 Jul 2026), the S27 weekly count 44 (données non consolidées). Cumulative hospitalisations reached 201 across the three CHU de Guyane sites (majority classic form, with 21 unusual forms and 8 severe forms); 1 death classified by SpF as unrelated to chikungunya. Under the ORSEC arboviroses plan the Littoral Ouest and Savanes remain the most active foyers, the Île de Cayenne has seven foyers under surveillance and the Maroni is in sporadic transmission. The cluster is the largest sustained autochthonous chikungunya transmission reported from an EU-outermost-region in 2026 and the most material French-overseas escalation point in the 2026 chikungunya arc. Vector: Aedes aegypti (yellow-fever mosquito) is the dominant GF chikungunya vector (Aedes albopictus is also established in GF but is not the principal outbreak vector here). The cluster is intentionally NOT folded into the metropolitan FR/CHIKV 2026 row (which covers metropolitan France only), the territory-scope decision recorded in MOS-2831 selected Option B (separate FR-GF record) over Option A (extend FR national row), preserving the metropolitan vs overseas scope separation that SpF's separate-bulletin practice operationalises.
How many Chikungunya cases were reported in Europe in 2025?
Across the countries Mosticare tracks, 2025 Chikungunya cases were: France 809, Italy 384. These are national totals from each country's health authority; for the complete EU/EEA figure, ECDC's surveillance is the primary source.
How many Chikungunya cases have been reported in Europe in 2026?
As of 20 July 2026, the countries Mosticare tracks report no autochthonous human Chikungunya cases year-to-date in 2026. The feed is refreshed weekly during transmission season.
Which mosquito transmits Chikungunya in Europe?
Chikungunya is transmitted in Europe by Aedes albopictus (Asian tiger mosquito). The fastest-expanding vector in Europe since 2005. Daytime feeder, striped legs, thrives in peri-urban water traps.
Which mosquito spreads chikungunya in Europe?
In Europe chikungunya is spread by Aedes albopictus, the Asian tiger mosquito, a daytime-biting species established across the Mediterranean basin and expanding northward by roughly 150 km per decade.
Is chikungunya increasing in Europe?
Autochthonous (locally-acquired) chikungunya in the EU/EEA is episodic, not a steady year-on-year trend: occasional, self-limiting summer clusters spread by the Aedes albopictus tiger mosquito, with most years since the first European outbreak in 2007 reporting no local cases at all. EU/EEA Member States have recorded autochthonous chikungunya in only 6 years between 2007 and 2025, 2007 (330), 2010 (2), 2014 (12), 2017 (303), 2024 (1) and 2025 (1,172) cases, with 2025 by far the largest on record (1,172). The two most recent seasons (2024: 1, then 2025: 1,172) show local transmission reaching larger clusters and further north, best read as rising risk of episodic outbreaks rather than a clean upward trend. Figures are reported locally-acquired (autochthonous) human chikungunya cases in EU/EEA Member States (mainland) per ECDC. Chikungunya transmission in Europe is episodic: self-limiting Aedes albopictus clusters that open and close rather than a continuous yearly burden, so most years since 2007 have had zero autochthonous EU/EEA cases and the series is intentionally gappy. Year-to-year comparisons are affected by changes in surveillance intensity, case definitions and vector spread, and any single warm season can produce an outsized cluster. Counts here exclude travel-imported cases and exclude EU outermost regions (e.g. Réunion and Mayotte), which ECDC reports separately and where 2025 case numbers were far larger. ECDC is the primary surveillance authority for the complete European total.
In which years has Europe had locally-acquired chikungunya, and how many cases?
Autochthonous chikungunya has been reported in EU/EEA Member States in 6 years between 2007 and 2025, 2007 (330), 2010 (2), 2014 (12), 2017 (303), 2024 (1) and 2025 (1,172) cases, with no local transmission in the intervening years. The largest season was 2025 (1,172). Source: ECDC; counts are mainland EU/EEA and exclude travel-imported cases and EU outermost regions such as Réunion.
What was the biggest chikungunya outbreak year in Europe?
2025, with 1,172 locally-acquired chikungunya cases across EU/EEA Member States, by far the largest European season on record and an order of magnitude above any earlier year. Source: ECDC; the figure excludes EU outermost regions, which ECDC reports separately.
Sources
- Istituto Superiore di Sanità (ISS)
- Santé publique France, bilan national chikungunya/dengue/Zika 2025 (édition nationale, enhanced arbovirus surveillance)
- Istituto Superiore di Sanità (ISS)
- Santé publique France · enhanced arbovirus surveillance
- Santé publique France, Direction régionale Guyane (SpF-Guyane weekly Bulletin régional Guyane: Surveillance épidémiologique du chikungunya, semaine 27, published 9 Jul 2026)
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About this data
Mosticare aggregates and re-publishes vector-borne disease surveillance from ECDC, EFSA, and national ministries of health. Mosticare is an aggregator, not a primary surveillance authority, every figure on this page cites the originating source and is independently verifiable. This is a partial aggregation; for the complete EU/EEA totals, ECDC is the primary source.
The data behind this page is published as free, machine-readable feeds under CC BY 4.0, the point-in-time incidence snapshot at /threat-map/feed.json (JSON Schema) and the multi-year trends at /threat-map/feed/trends.json (JSON Schema). See the live Europe threat map and the full data room.