Monitoring Aedes population using ovitrap index and larval abundance in an urban university residence
Autocidal ovitraps have played a significant role in surveillance and control of dengue vectors, Aedes aegypti and Aedes albopictus. Malaysia has witnessed the deployment of several types of autocidal ovitraps, which includes the Mosquito Larvae Trapping Device (MLTD) introduced by Kuala Lumpu...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Pusat Perubatan Universiti Kebangsaan Malaysia
2020
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| Online Access: | http://journalarticle.ukm.my/16282/1/20_ms0441_pdf_18074.pdf http://journalarticle.ukm.my/16282/ https://www.medicineandhealthukm.com/toc/15/2 |
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| Summary: | Autocidal ovitraps have played a significant role in surveillance and control of
dengue vectors, Aedes aegypti and Aedes albopictus. Malaysia has witnessed the
deployment of several types of autocidal ovitraps, which includes the Mosquito
Larvae Trapping Device (MLTD) introduced by Kuala Lumpur City Hall. This study
aimed to assess Aedes larval abundance and local meteorological variables in a
university residence, in Cheras, Kuala Lumpur. MLTD (n=30) baited with organic
NPK fertiliser (5:5:5) solutions were deployed. Larvae collection and trap servicing
were performed weekly for a duration of eight weeks. Rearing and species
identification for larvae were conducted in the laboratory. Out of 2,152 Aedes
larvae, 85% of them were Ae. albopictus whilst the remaining were Ae. aegypti.
Outdoor collection of Ae. albopictus surpassed its indoor collection (mean larvae
per trap of 9.28 versus 6.08). Conversely, an indoor collection of Ae. aegypti was
greater than its outdoor collection (mean larvae per trap of 1.72 versus 0.86). The
highest ovitrap indices were observed in Week 5 and 6 which were 90% and 93%,
respectively. Week 1 had the lowest ovitrap index, 30%. Our analyses revealed a
positive correlation between Aedes larval abundance and maximum temperature
(r=0.830, p=0.011) whereas minimum relative humidity was shown to have
a negative correlation (r=-0.778, p=0.023), with the larval abundance. Routine
monitoring of dengue vectors at its immature stages can provide information on the
density and fluctuation of the local mosquito population. Coupled with concurrent
meteorological variables, it can guide vector control operations as part of dengue
prevention strategies. |
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