Source: Government of Singapore
The National Environment Agency (NEA) launched the National Dengue Prevention Campaign 2025 today, as Singapore enters the traditional peak dengue season of May to October. At the launch event at Pasir Ris Sport Centre, Senior Minister of State for Sustainability and the Environment, Dr Janil Puthucheary, urged members of the public to stay vigilant and eradicate mosquito breeding sources to minimise the risk of dengue and Zika transmission in the community.
Dengue Outlook in 2025: Continued vigilance required as dengue risk factors remain high.
2 Close to 2,000 dengue cases were reported to date, a decrease of 74 per cent as compared to the same period last year. This is significantly lower than the number of cases reported in the same period in 2023 and 2024. Two dengue deaths due to local dengue infection have been notified this year as of 15 May 2025. Singapore’s low population immunity and the rise in dengue cases globally1, makes the local population vulnerable to dengue transmission. The continued presence of these dengue risk factors may lead to a potential increase in dengue cases, if insufficient action is taken.
3 The same Aedes mosquitoes that transmit dengue, is able to transmit Zika2 as well. While Zika is generally a mild and self-limiting disease for most people, the consequences can be more serious if a pregnant woman is infected. Although rare, Zika virus infection of a pregnant women can cause birth defects such as microcephaly in the babies.
4 The warmer months from May to October usually see higher dengue transmission in Singapore, due to accelerated development of the Aedes mosquito vector and faster multiplication of the dengue virus in mosquitoes. Therefore, it is critical that residents and stakeholders regularly practice the ‘B-L-O-C-K’ steps to suppress the Aedes mosquito population and ‘S-A-W’ actions to prevent mosquitoes bites and minimise risk of disease transmission.
Large Outbreaks Averted in 2023 and 2024 due to Strong and Sustained Community Vigilance
5 In 2023 and 2024, the surge in dengue cases was largely subdued3 despite a high baseline of dengue cases. Strong and sustained community vigilance against breeding and innovations like Project Wolbachia have helped to avert large outbreaks.
6 In 2024, over 13,600 dengue cases were reported, an increase of 37 per cent compared to 2023. 13 isolated Zika cases were also reported. NEA conducted about 686,000 mosquito inspections islandwide and uncovered about 23,900 mosquito breeding habitats. At dengue cluster areas, about 67 per cent of Aedes mosquito breeding detected were in homes, 27 per cent in public areas, 1 per cent at construction sites and 5 per cent in other premises type. During the same period, over 11,900 enforcement actions4 were taken against owners and occupiers of premises for mosquito breeding. About 748 fines and 61 Stop Work Orders were issued to construction sites, and 79 contractors were charged in court for repeat offences.
7 Studies on NEA’s Project Wolbachia showed that risk of contracting dengue was lowered by about 75 per cent at the Aedes-Wolbachia release sites and 45 per cent at adjacent areas. By the end of 2026, 800,000 households or about 50 per cent of all households in Singapore (from 580,000 today), will benefit from Project Wolbachia. NEA will also trial the use of Wolbachia-Aedes mosquitoes at dengue clusters to supplement traditional control operations.
8 NEA would like to thank all stakeholders, including premises operators, partners of the Inter-Agency Dengue Taskforce, Town Councils, grassroots leaders, community partners and volunteers, for their efforts in the fight against dengue.
Collective Action Remains Key to Fighting Dengue and Zika
9 The National Dengue Prevention Campaign 20255 emphasises that dengue prevention is a social responsibility, and will continue to rally the community to remain vigilant and reduce the risk of dengue infection.
10 Everyone has a critical role to play in dengue prevention and control. NEA urges all stakeholders to take immediate action to suppress the Aedes mosquito population and break disease transmission at their premises, by regularly practising the following ‘B-L-O-C-K’ steps.
- Break up hardened soil
- Lift and empty flowerpot plates
- Overturn pails and wipe their rims
- Change water in vases
- Keep roof gutters clear and place BTI insecticide inside
11 Residents, especially those residing at dengue cluster areas, or those diagnosed with or suspected to have dengue or Zika, should carry out the ‘S-A-W’ actions to prevent mosquitoes bites, which is how the disease spreads to more mosquitoes and people.
- Spray insecticide in dark corners around the house
- Apply insect repellent regularly
- Wear long-sleeve tops and long pants
12 Residents and premises owners can check the NEA website (www.nea.gov.sg) regularly for dengue updates, and use the myENV mobile app to set alerts on areas with dengue clusters and high Aedes aegypti mosquito populations.
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3 Dengue cases reported over the years in Annex A
4 Enforcement figures provisional as of 8 May 2025.
5 Details of NEA’s National Dengue Prevention Campaign 2025 are available in Annex B.
ANNEX A
Seasonal Trendline of Dengue Cases
ANNEX B
NEA’s National Dengue Prevention Campaign 2025
- The National Dengue Prevention Campaign 2025 emphasises that dengue prevention is a social responsibility, and continues to rally the community to remain vigilant and reduce dengue cases. This year’s campaign tagline “This is no small matter”, emphasises the serious health risks posed by the Aedes mosquito. Despite its small size, this vector can transmit deadly viruses including dengue and Zika. The campaign will be amplified across various media touchpoints to educate and engage residents on dengue prevention.
- Ground outreach efforts will be led by local Grassroots Advisers and Leaders, with support from NEA’s volunteers, to intensify dengue prevention outreach through community activities and house visits at dengue cluster areas and areas with high Aedes aegypti mosquito population. Nationwide outreach will be conducted over at least three months, to sustain awareness throughout the traditional peak dengue season.
- Additionally, in collaboration with the Communicable Diseases Agency (CDA), Zika prevention outreach materials have been produced and distributed to Obstetrics and Gynecology (O&G) clinics. These materials include the B-L-O-C-K and S-A-W messages to urge pregnant women and couples on their pregnancy journey to reduce mosquito breeding at source and prevent disease transmission.
Zika Brochure, developed in collaboration with CDA, to be distributed by O&G doctors to their patients, emphasises the B-L-O-C-K and S-A-W actions as well.