Dengue & Zika

Areas with Higher Aedes aegypti Mosquito Population

The information provided in this map is from August 2021.


(Map showing areas where Gravitraps deployed by NEA detected relatively higher Aedes aegypti mosquito population in August 2021. Areas not highlighted do not represent absence of Aedes aegypti mosquitoes.)

The female Aedes aegypti mosquito is the primary vector of dengue and Zika in Singapore. The Aedes aegypti mosquito thrives in our urban environment, which provides it with numerous habitats to lay its eggs in, and hosts to blood feed upon.

An incidence or outbreak of dengue, Zika or other mosquito-borne disease, is related to the simultaneous occurrence of the mosquito vector, circulating virus, and susceptibility of the human population. Dengue is endemic in Singapore, and areas with higher Aedes aegypti mosquito population may have a higher risk of dengue transmission, especially during the dengue season.

Residents living in areas with relatively higher Aedes aegypti mosquito population are urged to help reduce the mosquito population by regularly practising the Mozzie Wipeout, and reminding their families, friends and neighbours to remove stagnant water from within and around their homes. 

Stakeholders including Town Councils (TCs) are encouraged to use the data to prioritise their dengue prevention and control measures, and target areas with high mosquito population.

Residents must be vigilant even if their area is not highlighted as having a high Aedes aegypti mosquito population. Low risk does not mean no risk; one female mosquito can lay 300 eggs in her short lifespan, thus the localised population can expand very quickly.

Surveillance of the Aedes aegypti Mosquito Population with Gravitraps

NEA has deployed more than 68,000 Gravitraps at public  and landed housing estates  around Singapore.

Picture of Gravitraps

The Gravitrap, developed by NEA’s Environmental Health Institute (EHI), is designed to attract and trap female Aedes adult mosquitoes that are looking for sites to lay their eggs in. Female Aedes mosquitoes attempting to lay their eggs in the traps will be captured and prevented from biting other people. The Gravitrap also traps and prevents the emergence of any mosquitoes from eggs that are laid in the trap.

Please click on video to find out how do the Gravitraps work.


Gravitraps, when distributed across an area, help to monitor the Aedes mosquito population in the area and its vicinity. To strengthen our dengue control strategy, information on areas with relatively higher Aedes aegypti mosquito population is updated monthly on the NEA website. The sharing of mosquito population data serves as a new lead indicator for our partners and stakeholders to take proactive preventive measures in reducing the mosquito population and risk of dengue transmission.