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Joan Pereira: To ask the Minister for the Environment and Water Resources
whether NEA has done any study to determine the existence of a pattern of where
dengue clusters form so that preventive action can be carried out.
Reply by Mr Masagos Zulkifli:
The National Environmental Agency
(NEA) has conducted scientific studies to study the risk of dengue transmission
across Singapore. One example is the use of big data and geographic information
systems to analyse mosquito breeding and dengue transmission patterns. These
studies have found that the risk of dengue transmission increases with higher population
density, Aedes aegypti population, extent of urbanisation and historical
incidence of dengue. This provides a useful guide for NEA’s vector control
operations. For instance, before the traditional dengue season every year, NEA
deploys additional manpower to areas identified as higher risk to conduct
intensive source reduction activities to remove mosquito breeding habitats.
2 Throughout the year, NEA conducts
routine inspections and search-and-destroy operations guided by data collected
by the Aedes surveillance system, which comprises 50,000 Gravitraps
deployed islandwide. Developed in-house, Gravitraps are designed to attract and
trap adult female Aedes mosquitoes, the vector responsible for the
transmission of dengue, chikungunya and zika. The surveillance system shows that
a persistently high Aedes aegypti population increases the risk of localised
dengue transmission and the odds of a dengue cluster forming. An additional
14,000 Gravitraps are progressively being deployed to increase the area of
3 Everyone has a part to play in
preventing the spread of dengue. Between January and June this year, about 70%
of mosquito breeding habitats detected in dengue clusters were found in homes. The
community must play its part and step up the eradication of mosquito breeding
habitats by practising the 5-step Mozzie Wipe-out regularly. Effective source
reduction by all stakeholders is key to preventing the formation of dengue
clusters and disrupting the transmission cycles of the dengue virus in our
Last updated: 06 Aug 2019
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