Global summary
Dengue
As of August 2025, 3.6 million dengue cases and over 1,900 dengue-related deaths have been reported from 94 countries/territories globally since the beginning of 2025. In the Americas, by epidemiological week 29, there were 3,558,860 suspected dengue cases (cumulative incidence of 350 cases per 100,000 population), representing a 69% decrease compared to 2024 and 11% below the 5-year average. In Africa, over 7,000 cases and 6 deaths reported in Burkina Faso, Cabo Verde, Comoros, Guinea, Mali, Senegal, and Sudan. In general, Dengue has been in a declining trend in Asia in 2025.Chikungunya
Over 240,000 cases and 90 deaths reported in 2025 across 16 countries, with Brazil continuing to bear the brunt, reporting over 185,000 cases. Notable outbreaks in Asia include over 34,000 cases in India, Sri Lanka, Mauritius, Chika and Pakistan. China (Guangdong Province) reported over 7,700 cases; the largest outbreak ever recorded in China. In the Indian Ocean region, Réunion and Mayotte (France) have reported over 54,000 cases.Zika
In 2025, at least 350 confirmed Zika cases have been reported in the Americas, with Brazil continuing to lead with 285 confirmed cases. Other affected countries include Bolivia, Colombia, Costa Rica, Guatemala, Mexico, and Peru. The spread of Zika remains relatively contained.Regional summary
Bangladesh
In 2025, as of week 32, a total of 24 872 dengue cases and 104 dengue-related deaths have been reported. This is 312.1% of the number of cases (n= 7 969) and 138.7% of the number of deaths (n=75) reported till week 32 in 2024. Moreover, 669 chikungunya cases have been reported in Chattogram as of late July. Cases are concentrated in Dhaka and Chattogram, with Chattogram experiencing its highest levels in recent years. No Zika outbreaks have been reported.
China
In May 2025, China recorded 128 dengue cases, a seasonal increase linked to monsoon rains. Over 10,000 chikungunya cases have been reported, mostly in Guangdong Province, especially Foshan, Guangzhou, Shenzhen, and Dongguan. As of August 2025, China has not reported any Zika virus cases this year.
India
12,043 dengue cases and 6 deaths reported nationwide as of March 2025. 30,876 suspected chikungunya cases and 1,741 confirmed cases reported by March 2025. No zika reports.
Indonesia
As of June 2025, Indonesia’s dengue cases rose to 52,410 with 210 deaths. A major resurgence of chikungunya was reported in 2025, with over 20,000 suspected cases nationwide. The main affected areas are Jawa Barat, Jawa Tengah and Jawa Timur. Zika remains under surveillance with no active outbreak.
Laos
As of August 5, Laos reported 5,615 dengue cases and 1 death, with Vientiane accounting for nearly half the cases. Only 556 cases were reported between January and March, showing a significant drop compared to previous years. No chikungunya or Zika updates.
Malaysia
32,299 dengue cases and 21 fatalities reported from Jan 1 to July 5, down 58.6% from the same period in 2024. No major outbreak of chikungunya, but sporadic cases continue to be reported. Zika is not reported.
Maldives
In 2025, as of 30 April, a total of 347 cases of dengue have been reported compared to 641 cases during the same period in 2024. A total of 3 294 cases were reported in the entirety of 2024. Also reported 78 chikungunya cases. No Zika reports.
Nepal
In 2025, as of 31 July, a total of 2 587 cases of dengue have been reported compared to 4 777 cases during the same period in 2024. A total of 41 865 dengue cases and 15 deaths were reported throughout 2024. No confirmed outbreaks of chikungunya and zika.
Philippines
The Department of Health (DOH) has recorded over 124,000 cases of dengue across the country from January to June 2025. From July 13 to 26, 15,091 cases were recorded—a 7% increase from the previous two weeks. Alos reported 2,854 chikungunya cases - a 381% increase from previous years. No zika reports.
Singapore
3,122 dengue cases reported from January to mid-August. DENV-2 remains the dominant serotype since 2023. Also reported 17 chikungunya cases from January to August - more than double the 8 cases in the same period last year. 11 Zika cases reported as of mid-July, including 2 local cases confirmed in Woodlands Street 11 and 32, with persistent virus signals in mosquito samples.
Sri Lanka
From week 1 to week 30 in 2025, a total of 33,796 cases were reported compared to 32,301 cases and 56,227 cases during the same period in 2024 and 2023, respectively. Sri Lanka is experiencing its largest chikungunya outbreak in nearly 20 years, starting late 2024 and continuing into 2025. Genomic sequencing revealed the virus belongs to the Indian Ocean lineage (IOL), with unique mutations that enhance transmission via Aedes aegypti. No Zika cases reported.
Thailand
In 2025, as of 31 July, a total of 35,359 dengue cases and 34 dengue-related deaths have been reported. This is 63% of the number of cases (n=56 509) and 68% of the number of deaths (n=50) reported during the same period in 2024. Chikungunya (320 cases) is localized to the south. No Zika cases reported.
Vietnam
Over 44,400 cases and 11 deaths reported in the southern region by August. Ho Chi Minh City alone recorded 15,538 cases, a 159% increase from 2024. No chikungunya and zika reports.Data sources: AI tools, Media releases, WHO, healthmap, ProMed and European CDC; updated on 18/08/2025