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, over the past two weeks, dengue-related activity on the territory was low with a total of three confirmed cases. Since the beginning of the year, 246 dengue cases have been confirmed in French Guiana, averaging 8 per week. (Health surveillance in French Guiana. Bulletin of 14 August 2025). The serotype identified in the last two weeks was exclusively DENV-2. 

In Mayotte, 30 dengue cases have been reported this year as of the beginning of July (Chikungunya et dengue à Mayotte. Bulletin du 1 août 2025). No cases of dengue have been detected in the past two weeks, and only two cases since mid-June. This trend indicates a stable viral circulation. 

In Reunion, 44 dengue cases, of which 17 confirmed, have been reported since the beginning of the year and as of 10 August 2025 (Health surveillance in Reunion Island. Bulletin of 14 August 2025). The last autochthonous case was identified in week 17 of 2025 (end of April). 

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 29 of 2025, over 3.5 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 69% less compared to the cases reported in the same period in 2024 and 11% above the average of the last 5 years, according to the WHO PAHO report published on 9 August 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 13 August 2025, dengue has been an increasing trend of dengue cases in Bangladesh (total 2 513 new cases reported the week 4 - 10 August) compared to 2 141 cases reported the week of 28 July – 3 August. 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 decrease has been 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 by Thailand, Sri Lanka, Nepal and the Maldives. 

In Laos, Viet Nam and Singapore in 2025 so far dengue cases are lower than those reported in 2024 (Laos: 4 712 cases and one death as 26 July 2025; Vietnam: 28 787 cases and five deaths as of 22 June 2025; Singapore: 2 963 cases as of 26 July 2025. WPRO Dengue Situation update of 7 August 2025). In China, 1 257 cases were reported as of July 2025, a significantly higher number compared to the total cases as of July 2024 (554). 

In Afghanistan (EMRO), in 2025, the number of suspected dengue fever cases shows an increase since week 15 of 2025 (mid-April), with 595 cases reported as of 21 June 2025. 

Since the beginning of 2025, in Africa, over 9 800 cases and 20 deaths had been reported from Burkina Faso, Cabo Verde, Comoros, Guinea, Kenya, Mali, Mauritius, Nigeria, Senegal and Sudan (Africa CDC Epidemic Intelligence Report of 10 August 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.