Dengue – Multi-country (World) – Monitoring global outbreaks – Monthly update

Since the beginning of 2026, and as of October 2026, over 2.5 million cases of dengue and over 1 000 dengue-related deaths had been reported globally according to information from publicly available sources.  This is a decrease compared to the same period in 2025 (Communicable disease threats report, 8-14 November 2025, week 46).  

An overview based on publicly available information from official sources and reports from different regions highlighting trends in different countries/ territories is presented below. The country/ territory trends summarised are based on data availability at the time the report was prepared; more detailed analyses are therefore only provided for countries/ territories with sufficient data. 

EU/EEA

Since the beginning of 2026 and as of October 2026, France and Italy have reported locally acquired dengue transmission. 

For more information on locally acquired dengue cases reported in the EU/EEA excluding the outermost regions by France, please visit the dedicated ECDC website. With regards to EU/EEA outermost regions, a summary of recent trends is presented below:  

For the EU/EEA's outermost regions, a summary of recent trends is as follows: 

• Martinique, Guadeloupe and Saint Martin: In Martinique, dengue activity remained low as of October 2026. The epidemiological situation was stable with isolated clusters. In the period 28 September-25 October 2026, seven confirmed dengue cases were reported. In Guadeloupe, dengue circulation also remained low  with sporadic cases. In Saint Martin, no confirmed dengue cases were identified during the previous four weeks, and the situation has remained calm since May 2026. (Santé publique France, Dengue aux Antilles. Bulletin of 30 October 2026).  
• La Réunion: Dengue transmission remained at a low level with sporadic cases only. A total of 350 confirmed dengue cases had been reported since the beginning of 2026 as 30 October (Surveillance sanitaire à La Réunion. Bulletin du 30 octobre 2026-2026, Surveillance sanitaire à La Réunion. Bulletin du 4 septembre 2026; Surveillance sanitaire à La Réunion. Bulletin du 18 septembre 2026, Surveillance sanitaire à La Réunion. Bulletin du 25 septembre 2026).  
• French Guiana: Dengue activity remained low as of 29 October 2026 (Santé publique France, Chikungunya et dengue en Guyane. Bulletin of 29 October 2026).  

Americas

In the Americas, as of week 40 of 2026 (ending 4 October), 1 845 488 dengue cases have been reported, of which 30% were laboratory-confirmed, according to 30 October 2026. The current reported cases are 54% fewer than during the same period in 2025, and 61% below the five-year average. While all four serotypes have been reported in the region to date in 2026, their distribution varies across the different countries of PAHO (Report on the epidemiological situation of dengue in the Americas). As of week 40, in 2026, most cases have been reported by Brazil (1 368 616), Colombia (88 469), Peru (72 111), Mexico (61 894) and Bolivia (59 953).  

South-East Asia

According to the WHO South-East Asia Region Epidemiological Bulletin, 21st edition,21 October 2026, and earlier 2026 bulletins, dengue has been reported in Bangladesh, Bhutan, India, Maldives, Myanmar, Nepal, Sri Lanka, Thailand and Timor-Leste since October 2025. Available information on epidemiological trends is summarised below.  

• Bangladesh: Bangladesh has experienced an increase in dengue activity since early July 2026. As of 19 October, 114 251 cases and 352 deaths had been reported in 2026, with September accounting for approximately 51% of cases and 57% of deaths. During week 42 (12-18 October), 13 125 suspected dengue cases were reported, a 2% increase compared with 12 817 cases in week 41 and 1.5 times the caseload reported during the corresponding week of 2025 (5 290 cases). Forty-five dengue-related deaths were reported in week 42, compared with 41 in week 41 (WHO South-East Asia Region Epidemiological Bulletin, 21st edition, 21 October 2026). 
• India: Dengue activity increased in September 2026. A total of 23 470 cases were reported during September, representing a 72% increase compared with August (13 610 cases). As of the end of September, 70 140 cases had been reported in 2026, slightly above the 68 356 cases reported during the corresponding period of 2025 (WHO South-East Asia Region Epidemiological Bulletin, 21st edition, 21 October 2026). 
• Nepal: Dengue activity increased during the second half of 2026. Overall, 1 908 cases were reported in September 2026 (WHO South-East Asia Region Epidemiological Bulletin, 21st edition, 21 October 2026). 
• Sri Lanka: Sri Lanka reported 1 156 suspected dengue cases in week 37, broadly unchanged from 1 152 cases in week 36 but 90% higher than the 608 cases reported during the corresponding week of 2025 (WHO South-East Asia Region Epidemiological Bulletin, 21st edition, 21 October 2026). 
• Thailand: Dengue activity continued to decline in October. In week 42 (12-18 October), 501 suspected dengue cases were reported, a 43% decrease from 884 cases in week 41 and 41% fewer than the 853 cases reported during the corresponding week of 2025. No new dengue-related deaths were reported during week 42 or week 41 (WHO South-East Asia Region Epidemiological Bulletin, 21st edition, 21 October 2026). 

Western Pacific Region

In the WHO Western Pacific Region, dengue transmission continues to be reported by several countries and territories according to WHO WPRO Dengue Situation Update #757 (29 October 2026). Available information from the WHO WPRO report for countries/territories with recent updates are summarised below: 

• Cambodia: As of 18 October 2026, 119 222 cases and 121 deaths had been reported. This was a 137% increase compared with the corresponding period of 2025 (50 213 cases). Weekly cases had declined since the peak in week 35 but remained above the epidemic threshold (WHO WPRO Dengue Situation Update #757, 29 October 2026). 
• Indonesia: In September 2026, 821 cases and one death were reported. The total number of cases reported in 2026 and until September is 97 460 including 254 deaths. Monthly case numbers had decreased since January (WHO WPRO Dengue Situation Update #757, 29 October 2026). 
• Laos: During 12-18 October, 232 cases and one death were reported, compared with 227 cases the week before. The 2026 cumulative total number of cases was 6 133, 39.9% lower than the 10 204 reported during the corresponding period of 2025 (WHO WPRO Dengue Situation Update #757, 29 October 2026). 
• Singapore: During 11-17 October, 61 cases were reported, 84.8% more than during the corresponding period of 2025 (33). The cumulative 2026 total was 2 704 cases. Preliminary October serotyping identified DENV-1 (51.4%), DENV-2 (13.5%) and DENV-3 (35.1%); DENV-4 was not detected (WHO WPRO Dengue Situation Update #757, 29 October 2026). 
• Viet Nam: In week 43 (19-25 October), 5 390 new cases were reported, 37.4% fewer than in the previous week (8 616). By week 43, 166 507 cases and 21 deaths had been reported in 2026, 24.7% more than during the corresponding period of 2025 (133 473 cases). Approximately 68% of cases were reported from the southern region (WHO WPRO Dengue Situation Update #757, 29 October 2026). 
• Pacific island countries and areas: Among the 20 of 21 Pacific island countries and areas with available syndromic surveillance data, most reported decreasing or low dengue-like illness activity in weeks 41 and 42. Increased dengue-like illness activity was observed in the Marshall Islands (WHO WPRO Dengue Situation Update #757, 29 October 2026).  

Africa

According to the Africa CDC Epidemic Intelligence Report of 11 October 2026, a total of 4 407 cases has been reported in the continent from the Central African Republic (1), Kenya (1 583), Mali (2 531), Mauritania (110), Nigeria (95), Senegal (86) and Sierra Leone (1).  

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 monitors this threat through its epidemic intelligence activities and reports on it on a monthly basis. A summary of the worldwide overview of dengue is available on ECDC's website.