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Source: Asia Pacific Region 2 – Singapore

The weekly number of reported dengue cases declined in the past seven weeks by 56 per cent, whilst the number of dengue clusters declined by 48 per cent. However, continued vigilance is critical as dengue cases remain high, and NEA’s Gravitrap surveillance system has detected an increase in the Aedes aegypti mosquito population in the community in recent weeks

Singapore, 30 September 2020 – As of 29 September 2020, there have been 30,431 reported dengue cases this year. There were 593 dengue cases reported last week, a drop of 78 cases from the week before. Last week was the seventh consecutive week in which there was a decline in the weekly number of dengue cases. However, the National Environment Agency (NEA)’s Gravitrap surveillance system, which monitors the Aedes aegypti mosquito population at residential areas, has detected early signs of an increasing mosquito population in the community since the beginning of September, with an increase of 12 per cent in the last three weeks. As the number of dengue cases is still high and the rate of decline in weekly cases has slowed down in recent weeks, the increasing Aedes aegypti mosquito population may lead to another surge in dengue cases. It remains critical that stakeholders and the public work continue to work together with NEA to arrest the rise in the Aedes aegypti mosquito population in the community.

Concerted and proactive preventive efforts by key stakeholders, community partners and residents

2          NEA and our partners in the Inter-Agency Dengue Task Force (IADTF) have kept up inspections at dengue cluster areas, and maintained a high tempo of preventive inspections for mosquito breeding as well as dengue cluster operations, in order to curb dengue transmission. In addition, NEA has provided Town Councils (TCs) and stakeholders with Gravitrap surveillance data, to help them prioritise their dengue prevention and control measures, and to target areas with higher Aedes aegypti mosquito population. These measures can include stepping up the cleaning of drains in certain areas, and removing discarded receptacles to prevent chokes and accumulation of stagnant water. Areas that TCs can check to look out for mosquito breeding include: inspection chambers, lightning conductor pits, pump rooms, water tanks, as well as rooftops and gullies. Granular insecticide or Bti (Bacillus thuringiensis israelensis) larvicide can be added to stagnant water bodies that cannot be removed.

3          The Aedes aegypti mosquito is the primary vector for the transmission of dengue, and its high population is one of the reasons for the high number of dengue cases experienced this year. Since late 2019, NEA has made available information on areas with higher Aedes aegypti mosquito population, to facilitate targeted and preventive action by key stakeholders, community partners and residents (refer to Annex A for steps on how to enable notifications on the myENV app). There are currently over 120 residential areas with higher Aedes aegypti mosquito population (refer to Annex B for areas with higher Aedes aegypti mosquito population). Residents can go to the NEA website and myENV app to obtain information about the Aedes aegypti mosquito population in these areas, to enable them to take immediate action to reduce the mosquito population, and protect themselves and their families.

Dengue cluster situation update

4          There are 195 dengue clusters reported as of 29 September 2020, 11 clusters fewer than the 206 clusters reported the previous week (on 22 September 2020). With the concerted efforts of NEA and the community and stakeholders, the following dengue clusters have been closed last week:  

  • 384-case cluster at Aljunied Road / Geylang Road
  • 332-case cluster at Bukit Panjang Ring Road
  • 321-case cluster at Arthur Road
  • 148-case cluster at Ang Mo Kio Avenue 3
  • 140-case cluster at Mei Chin Road
  • 135-case cluster at Balmoral Crescent
  • 109-case cluster at Elliot Road
  • 103-case cluster at Bedok Reservoir Road
  • 99-case cluster at Birch Road
  • 55-case cluster at Yishun Ring Road
  • 53-case cluster at Eunos Avenue 8

5          Overall, we have closed about 92 per cent, or 2,348 of 2,543, of the dengue clusters notified since the start of this year. We have also observed a slower rate of disease transmission at some of the larger dengue clusters, such as the 179-case cluster at Balam Road, with an average of less than one case reported per day in the past two weeks.

6          However, the total number of dengue clusters reported islandwide remains high. There are still large dengue clusters located at Arnasalam Chetty Road / Kim Yam Road, Aljunied Road / Geylang Road / Guillemard Road, Ang Mo Kio Avenue 2, East Coast Road / Jalan Baiduri, and Bedok North Avenue1, where intensive vector control operations are ongoing. To combat these large dengue clusters, NEA has been working intensively with key stakeholders from various Government agencies in the IADTF, including TCs, on sustained environmental management efforts.

7          We are still in the peak dengue season, and weekly cases can continue to remain high beyond October if mosquito breeding prevention measures are not sustained by all stakeholders. We urge everyone to maintain good housekeeping and ensure that essential vector control measures are undertaken at all premises under their responsibility, to prevent mosquito-borne disease transmission. Residents, especially those residing in dengue cluster areas, should do their part and carry out the three protective actions against dengue – spray insecticide in dark corners around the house, apply insect repellent regularly, and wear long-sleeve tops and long pants. All stakeholders should also continue to do the Mozzie Wipeout at least once a week, and ensure that their homes, premises and immediate surroundings are free from stagnant water.

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For more information, please submit your enquiries electronically via the Online Feedback Form or myENV mobile application. Alternatively, you contact us at 6225 5632.


ANNEX A

Guide on how to enable notifications on myENV app

Note:

  • Users must update the myENV app to the latest version, in order to set up the latest notifications. Instructions on how to enable notifications on the myENV app are appended below.
  • Information on areas with higher Aedes aegypti mosquito population will be updated monthly. Notification of these areas with higher Aedes aegypti mosquito population will be sent via myENV app weekly, to remind users to do the Mozzie Wipeout.

ANNEX B

Areas with higher Aedes aegypti mosquito population in August 2020, detected by Gravitraps deployed by NEA at public housing estates

 

MIL OSI Asia Pacific News