Dengue worldwide overview

In Madeira, two locally acquired cases were reported on 18 February, with symptom onset in January 2025. In the third week of January, entomological investigations confirmed the presence of dengue in mosquitoes captured on Madeira. 

In Guadeloupe, the circulation of the virus continues to within the archipelago, being classified epidemic of phase 2 level 1 (isolated outbreaks) (Epidemiological Bulletin of French Antilles, 26 June 2025). The most prevalent serotype continues to be DENV-3 (Epidemiological Bulletin of French Antilles, 26 June 2025). 

In Martinique, the epidemiological situation is characterised as phase 1 (sporadic cases reported; Epidemiological Bulletin of French Antilles, 26 June 2025). The classification was modified in April following a decrease in reported cases since March (Epidemiological Bulletin of French Antilles, 3 April 2025). 

In Saint Martin and Saint Barthelemy dengue circulation continues, but at lower levels (epidemic phase 1), with no confirmed cases reported in both islands (Epidemiological Bulletin of French Antilles, 14 August 2025 ). In Guyane, dengue activity continued to be low with a total of five confirmed cases in weeks 37 and 38. Since the beginning of the year, 275 dengue cases have been confirmed and 98% of the 186 serotyped samples are DENV-2 (Surveillance sanitaire en Guyane. Bulletin du 25 septembre 2025). 

In Mayotte, 30 dengue cases have been reported this year as 8 September 2025. No cases of dengue have been detected in recent weeks (Surveillance sanitaire à Mayotte. Bulletin du 8 septembre 2025). 

In Reunion, 44 dengue cases, of which 17 confirmed, have been reported since the beginning of the year (Health surveillance in Reunion Island. Bulletin of 14 August 2025). The last autochthonous case was identified in week 17 of 2025 (end of April) (Surveillance épidémiologique à La Réunion, week 38). A summary of recent epidemiological trends of dengue outside EU/EEA of the first seven months of 2025 is presented below. The summary is based on available information from official sources and reports from different countries/territories. 

In the PAHO, as of week 36 of 2025, over 3.8 million cases have been reported of which 40% are laboratory confirmed. The decreasing trend after the peak observed after weeks 12-14 continued. The currently reported cases are 68% less compared to the cases reported in the same period in 2024 and 10% above the average of the last 5 years, according to the WHO PAHO report published on 26 September 2025. While all serotypes have been reported as of week 29 of 2025, their distribution differs in the different countries of PAHO (Report on the epidemiological situation of dengue in the Americas). 

According to the SEARO report published on 24 September 2025, there has been an increasing trend of dengue cases in Bangladesh (total 3 940 new cases reported the week 15-21 September 2025) compared to 3 480 cases reported the week of 8-14 September. The total of cases reported so far in 2025 is higher than the total reported the same period in 2024. India continues reporting cases of dengue, too. A decreasing trend continues being noted in Kerala and in Karnataka. In both areas the cases are lower compared to the same period last year. 

Cases of dengue have also been reported in 2025 by Thailand (currently decreasing trend with a total 43 969 cases reported this year until 31 August 2025), Sri Lanka (36 611 cases in 2025 until week 18-24 August), Maldives (633 cases as of 30 June) and Nepal (3 789 cases in 2025; overall, lower than the cases reported the same period the last two years). According to the WPRO Dengue Situation update of 2 October 2025, in Indonesia, Malaysia, Laos, and Singapore in 2025 so far dengue cases are lower than those reported in 2024 (Indonesia: 118 021 cases as of August 2025; Malaysia: 41 751 cases reported as of 20 September 2025, Laos: 8 925 cases and one death as 21 September 2025; Singapore: 3 402 cases in 2025 and as of 20 September). In Viet Nam cases have been showing an increasing trend the last weeks with a cumulative of 92 926 cases and 17 deaths as of 26 September 2025. In China, 1 702 cases were reported as of August 2025 (lower than the number of cases in the same period in 2024) and a total of 1 959 have been reported this year. 

In Afghanistan (EMRO), in 2025, the number of suspected dengue fever cases shows an increase since week 15 of 2025 (mid-April), with 1 119 cases reported as of 16 August 2025 (Afghanistan Outbreaks Situation Report week 33 2025). 

Since the beginning of 2025, in Africa, over 12 000 cases and 20 deaths had been reported from Burkina Faso, Cabo Verde, Comoros, Guinea, Kenya, Mali, Mauritius, Nigeria, Senegal and Sudan. In week 37 cases were reported by Mali and Senegal according to Africa CDC (Africa CDC Epidemic Intelligence Weekly Report, September 2025 – Africa CDC). 

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.