Global summary
Dengue
Over 3 million suspected cases reported in the Americas by epidemiological week 21 (mid-June 2025), though this marks a 70% reduction compared to 2024 and 12% below the 5-year average. In Africa, over 7,000 cases and six deaths have been reported across several countries. In Asia, notable increases include 345 suspected cases in Afghanistan (as of mid-May) and 12,638 cases in Sri Lanka through end-March.Chikungunya
Approximately 220,000 cases and 80 deaths reported globally across 14 countries by early June. The Americas are disproportionately affected: over 141,000 cases in Brazil and a total of 431,000+ cases with three deaths across the region. In Asia, 33,000+ cases from India, Sri Lanka, Pakistan. Outbreak hotspots: Réunion and Mayotte (France) remain active, with Réunion alone reporting ~27,668 local cases in 2025.Zika
The Americas recorded at least 333 confirmed cases in 2025, primarily in Brazil (271 cases), with reported cases in Bolivia, Colombia, Costa Rica, ElSalvador, Guatemala, Mexico, and Peru. In Brazil, through late March, there were 7,364 cases of Zika (565 confirmed) across Argentina, Bolivia, and Brazil.Regional summary
Bangladesh
In 2025, as of week 22, a total of 4,690 dengue cases and 26 dengue-related deaths have been reported. This is 162% of the number of cases (n= 2,903) and 59% of the number of deaths (n=44) reported at the same time (week 22) in 2024. Chikungunya cases remain sporadic (15 confirmed), with no Zika outbreaks.
China
In May 2025, China recorded 128 dengue cases, a seasonal increase linked to monsoon rains. No chikungunya or Zika cases were reported.
Indonesia
As of June 2025, Indonesia’s dengue cases rose to 52,410 with 210 deaths. Chikungunya cases reached 1,245, primarily in Java. Zika remains under surveillance.
Laos
The cumulative number of cases reported in 2025 (as of epidemiological week 20) is 1,040, which is 64% lower than during the same period in 2024 (n= 2,925). No chikungunya or Zika updates.
Malaysia
As of May 2025 (Epidemiological week 21), there have been 25,382 dengue cases, inclusive of 14 fatalities in the country, which is 59.1% reduction in the 62,107 cases (46 fatalities) recorded during the same period in 2024. The country also reported 310 chikungunya cases. 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. No chikungunya or Zika reports.
Nepal
In 2025, as of 30 April, a total of 933 cases have been reported compared to 1,744 cases during the same period in 2024. A total of 41,865 dengue cases and 15 deaths were reported in the entirety of 2024. Chikungunya (12 cases) emerged in Kathmandu Valley. No Zika reports.
Pakistan
As of June 2025, chikungunya cases surged to 1,020, with dengue cases at 580. Zika is not reported.
Philippines
The Department of Health (DOH) has recorded over 110,000 cases of dengue across the country from January to May 10, 2025. The most recent data from DOH showed that more than 19,000 cases were logged in Metro Manila from January to May 17, 2025. This shows a 224% increase compared to the same period in 2024.
Singapore
As of 17 May 2025, a total of 1,895 dengue cases have been reported in 2025, which is a 74% decrease compared to the same period in 2024 (n=7,431). Preliminary results of all positive dengue samples serotyped in May 2025 showed DEN-1, DEN-2, DEN-3 and DEN-4 at 14.6%, 65.9%, 14.6% and 4.9%, respectively. No chikungunya or Zika outbreaks reported.
Sri Lanka
From week 1 to week 21 in 2025, a total of 22,836 cases were reported compared to 24,481 cases and 38,009 cases during the same period in 2024 and 2023, respectively. Chikungunya (45 cases) appeared in Colombo. No Zika cases reported.
Thailand
In 2025, as of 30 April, a total of 10,992 dengue cases and ten dengue-related deaths have been reported. This is 39% of the number of cases (n= 28,371) and 30% of the number of deaths (n=33) reported at the same time in 2024. Chikungunya (320 cases) is localized to the south. No Zika cases reported.
Vietnam
As of 18 May 2025, there have been 20,832 cases, and five deaths reported this year. Compared to the same period in 2024 (23,111 cases and six deaths), there has been a 9.86% decrease in the cumulative number of cases, while the number of deaths increased by one case. Chikungunya (75 cases) emerged in Ho Chi Minh City. No Zika cases reported.Data sources: Media releases, WHO, healthmap, ProMed and European CDC; updated on 16/06/2025