Based on data submitted up to 31 December 2025

Epidemiological summary

Since the beginning of 2025 and as of 31 December 2025, two countries in Europe have reported cases of chikungunya virus disease: France (788) and Italy (384). This week, no new cases of chikungunya virus disease have been reported to ECDC.

All clusters1 reported in France and Italy are now closed.

Seasonal weather conditions for vector-borne transmission are currently unfavourable in most parts of mainland Europe. As further new cases are unlikely, given the current unfavourable seasonal weather conditions for vector-borne transmission, ECDC concludes its weekly reports for the 2025 season.

Please find the current chikungunya virus disease risk assessment for mainland EU/EEA on ECDC’s dedicated chikungunya webpage.

Introduction

Chikungunya is a mosquito-borne viral disease that is emerging in Europe, with locally acquired cases reported in several EU/EEA countries. In the light of this development, the European Centre for Disease Prevention and Control has implemented seasonal enhanced surveillance to monitor the occurrence of cases in the EU/EEA. The primary objective is to inform public health authorities and support the implementation of appropriate response measures.
Chikungunya virus disease is a notifiable disease at the EU level and cases are reported in accordance with the EU case definition. The table and map in this report show the countries and areas where chikungunya virus disease cases – and their corresponding case numbers – have been reported to the European surveillance portal for infectious diseases (EpiPulse Cases).
Please note that cases acquired in Portuguese and Spanish Outermost Regions are included. However, due to the distinct epidemiological situation and differences in surveillance systems, cases acquired in the French Outermost Regions are not included.
Here we present the report as of 31 December 2025.

Overview of chikungunya virus disease cases in the EU/EEA

Countries and regions with locally acquired2 chikungunya virus disease cases in 2025 as of 31 December 2025

*Nomenclature of territorial units for statistics

**Local administrative unit

When importing case_summary.csv in MS Excel, please do not forget to select Unicode (UTF-8) as encoding.

Case summary (.csv)

Spatial distribution of locally acquired chikungunya virus disease cases in 2025 as of 31 December 2025

Please follow the link to open the interactive dashboard.

  1. Clusters are epidemiologically- and/or microbiologically-linked cases as defined by national authorities. Clusters can also be single, sporadic cases. Reporting to ECDC is initiated only after a confirmed case is identified in a cluster; probable cases are included only once this condition is met. Clusters are reported as “closed”, 45 days after the last reported date of symptom onset (or any other relevant date when the date of onset is missing). This 45-day period accounts for the estimated time from symptom onset until viraemia levels are sufficient to infect a mosquito (four days), the lifespan of an Aedes mosquito in natural circumstances (23 days) and the maximum intrinsic incubation period (14 days), with an added four-day safety margin for clinical diagnosis of new cases. ↩︎
  2. Cases acquired within the reporting country. ↩︎