Chikungunya worldwide overview
Situation update, June 2025
Since the beginning of 2025, and as of beginning of June, approximately 220 000 CHIKVD cases and 80 CHIKVD-related deaths have been reported in 14 countries/territories. Cases have been reported in the Americas, Africa, and Asia, and while no cases have been reported in mainland Europe, in Réunion and Mayotte (outermost regions of the European Union), CHIKVD outbreaks are ongoing.
In 2025 to date, the Americas account for the highest number of CHIKVD cases reported worldwide. As of June 2025 (data collected on 26 May 2025), the countries reporting the highest number of CHIKVD cases are Brazil (141 436), Argentina (2 521), Bolivia (605) and Peru (46). A complete list of the countries of the Americas reporting CHIKVD cases can be found on PAHO's dedicated website.
As of beginning of June 2025, over 33 000 CHIKVD cases were reported in Asia from India, Sri Lanka and Pakistan. In Africa, CHIKVD cases in 2025 have been reported by Senegal.
To date, no autochthonous cases of CHIKVD have been reported in mainland Europe in 2025. However, over 51 000 CHIKVD cases have been reported from the French outermost region Réunion as of end May 2025. Cases have been reported in all of the island's municipalities. Level 4 of the ORSEC 'Arboviruses' system remains activated, which corresponds to the circulation of a medium-intensity epidemic. In Mayotte, 560 autochthonous cases of CHIKVD have also been reported. According to the bulletin published on 2 June 2025, Mayotte has been moved to the epidemic phase (phase 3), which indicates intense and widespread transmission of the virus throughout the territory.
Three-month Chikungunya virus disease case notification rate per 100 000 population, March 2025 - May 2025
ECDC assessment:
The likelihood of onward transmission of dengue and chikungunya virus in mainland Europe is linked to importation of the virus by viraemic travellers into receptive areas with established and active competent vectors (e.g. Aedes albopictus and Aedes aegypti). Aedes albopictus is established in a large part of Europe. In Europe and neighbouring areas, Aedes aegypti is established in Cyprus, on the eastern shores of the Black Sea, and in the outermost region of Madeira.
The environmental conditions in the areas of mainland Europe where Ae. albopictus or Ae. aegypti are established are currently becoming favourable for mosquito activity and virus replication in mosquitoes. The risk of locally acquired chikungunya and dengue virus transmissions is therefore increasing. All past autochthonous outbreaks of CHIKVD and dengue in mainland Europe to date have occurred between June and November.
More information on autochthonous transmission of chikungunya and dengue virus in the EU/EEA is available on ECDC's webpages, and in ECDC's factsheets on dengue and CHIKVD.
Map
Twelve-month Chikungunya virus disease case notification rate per 100 000 population, June 2024-May 2025
Since the beginning of 2025, and as of beginning of June, approximately 220 000 CHIKVD cases and 80 CHIKVD-related deaths have been reported in 14 countries/territories. Cases have been reported in the Americas, Africa, and Asia, and while no cases have been reported in mainland Europe, in Réunion and Mayotte (outermost regions of the European Union), CHIKVD outbreaks are ongoing.
