Key facts
- Since the beginning of 2025, over 30 000 chikungunya virus disease (CHIKVD) cases and 14 CHIKVD-related deaths have been reported worldwide. A total of 14 countries/territories have reported CHIKVD cases from the Americas (11), Asia (1), Africa (1), and Europe (1). No autochthonous cases of CHIKVD have been reported in mainland Europe in 2025. La Reunion has reported CHIKVD cases in 2025.
- In 2025, over 600 000 dengue cases and over 150 deaths have been reported from 48 countries/territories globally. As of 24 February 2025, dengue circulation has been reported in Africa, America, South-East Asia and the Western Pacific region.
- The environmental conditions in the areas of the EU/EEA where Ae. albopictus or Ae. aegypti are established are currently unfavourable for mosquito activity and virus replication in mosquitoes. It is therefore unlikely that locally-acquired chikungunya and dengue virus transmission will occur until conditions become favourable in early summer.
Overview
Since the beginning of 2025, and as of 25 February, over 30 000 CHIKVD cases and 14 CHIKVD-related deaths have been reported in 14 countries/territories from the Americas (11), Africa (1), Asia (1), and Europe (1).
In 2025, the Americas account for the highest number of CHIKVD cases reported worldwide. As of February, CHIKVD cases have been reported from Brazil (31 484), Argentina (512), Bolivia (33) and Paraguay (23). Additional countries in the Americas reporting CHIKVD cases can be found on PAHO’s dedicated website.
Outside of the Americas, CHIKVD cases have been reported in Asia from Pakistan (201). One African country reported CHIKVD cases in 2025: Senegal (2).
No autochthonous cases of CHIKVD have been reported in mainland Europe in 2025. However,
1 631 CHIKVD cases have been reported from the French overseas department of La Réunion. Cases are now reported in 22 of 24 municipalities. Due to the increase in the number of cases and the spread of outbreaks, Level 3 of the ORSEC 'Arboviruses' system has been activated, which corresponds to the circulation of a low-intensity epidemic.
In 2025, CHIKVD-associated deaths have also been reported from Brazil (14).
DengueSince the beginning of 2025, 640 349 dengue cases and 159 dengue-related deaths have been reported from 48 countries/territories. The 15 countries reporting most cases are: Brazil (518 017), Colombia (31 967), Mexico (14 587), Peru (11 833), Vietnam (6 945), Sri Lanka (6 801), Ecuador (6 607), Paraguay (6 597), Guyana (6 012), Nicaragua (5 702), Guatemala (4 439), Thailand (4 005), Bolivia (2 354), Guadeloupe (2 220) and India (1 847).
As of 25 February 2025, dengue circulation has been reported in Africa, America, South-East Asia and the Western Pacific region.
In mainland Europe, no autochthonous cases have been reported in 2025.
In Madeira, two locally acquired cases were reported on 18 February, with symptom onset in January 2025. Following the regional response plan, extra active entomological monitoring was initiated upon suspicion of locally acquired cases.
In Guadeloupe, the current situation is classified as an epidemic of phase 4 level 1 (confirmed epidemic) (Epidemiological Bulletin of French Antilles, published 20 February 2025). Since week 4 there has been a decrease in the number of medical consultations and a decrease in emergency room visits for suspected dengue fever. The most prevalent serotype, according to the recent Epidemiological Bulletin of French Antilles, published 20 February 2025 continues to be DENV-3.
In Martinique, over 50 confirmed cases have been reported so far in 2025. The epidemiological situation is characterised as phase 2 (level 2; outbreaks that can evolve or multiple outbreaks with epidemiological links among them).
In Saint-Martin and Saint-Barthélemy dengue circulation continues, but at lower levels (epidemic phase 1), with only sporadic cases or outbreaks without epidemiological links being reported (Epidemiological Bulletin of French Antilles, 20 February 2025).
In French Guyana, case numbers have decreased in recent months and are showing a stable trend at lower levels. The trends are being monitored (Health surveillance in French Guiana. Bulletin of 20 February, 2025).
In La Reunion, 12 dengue cases, of which four confirmed by PCR, have been reported since the beginning of the year and as of 10 February 2025. Circulation is currently continuing at low levels.
A summary of recent epidemiological trends of dengue outside EU/EEA of the first weeks of 2025 is presented below. The summary is based on available information from official sources and reports from different countries/territories.
According to the country report published on 16 February 2025, in Bangladesh, so far in 2025, overall, the total number of dengue cases in 2025 is higher than during the same period in 2024, while the number of deaths in 2025 is lower (1 493 cases and 14 deaths in the first six weeks of 2025 versus 1 224 cases and 18 deaths in the first six weeks of 2024).
In India, cases continued to be reported during the first weeks of 2025, as mentioned in the SEARO report published on 12 February 2025. In Sri Lanka in 2025 so far, dengue cases have been lower than those reported in 2024 (SEARO report published on 12 February 2025).
In Laos, Vietnam and Singapore in 2025 so far, dengue cases are lower than those reported in 2024 (WPRO Dengue Situation update of 20 February 2025). In China, 49 cases and no deaths were reported in January 2025.
In French Polynesia, an increasing number of cases was reported in January 2025 compared to the same period in 2024.
In 2025, in Africa, over 2 100 cases and one death have been reported from Burkina Faso, Cabo Verde, Mali, Senegal and Sudan (Africa CDC Epidemic Intelligence Report of 10 February 2025).
Note: the data presented in this report originate from both official public health authorities and non-official sources, such as news media, and depending on the source, autochthonous and non-autochthonous cases may be included. Data completeness depends on the availability of reports from surveillance systems and their accuracy, which varies between countries. All data should be interpreted with caution and comparisons, particularly across countries, should be avoided due to under-reporting, variations in surveillance system structure, different case definitions from country to country and over time, and use of syndromic definitions.
ECDC assessment
The Americas are currently facing the largest ever outbreak of dengue. As a result, there has been a substantial increase in the number of cases of dengue imported to the EU/EEA since the beginning of 2024.
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 Europewhere Ae. albopictus or Ae. aegypti are established are currently unfavourable for mosquito activity and virus replication in mosquitoes. It is therefore unlikely that locally acquired chikungunya and dengue virus transmissions will occur until conditions become favourable in early summer. 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.
