Weekly Variation on Susceptibility Status of Aedes Mosquitoes against Temephos in Selangor, Malaysia

Chen, C.D. and Nazni, W.A. and Lee, H.L. and Sofian-Azirun, Mohd (2005) Weekly Variation on Susceptibility Status of Aedes Mosquitoes against Temephos in Selangor, Malaysia. Tropical Biomedicine, 22 (2). pp. 195-206. ISSN 0127-5720

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Abstract

Larvae of Aedes aegypti and Aedes albopictus obtained from 6 consecutive ovitrap surveillance (OS) in Taman Samudera and Kg. Banjar were evaluated for their susceptibility to temephos. Larval bioassays were carried out in accordance with WHO standard methods, with diagnostic dosage (0.012 mg/L) and operational dosage (1 mg/L) of temephos respectively. Aedes aegypti and Ae. albopictus obtained from six OS in Taman Samudera showed resistance to diagnostic dosage of temephos with percentage mortality between 5.3 to 72.0 and 9.3 to 56.0, respectively, while Ae. aegypti and Ae. albopictus obtained from Kg. Banjar showed resistance to temephos with percentage mortality between 16.0 to 72.0 and 0 to 50.6, respectively. Only two strains of Ae. aegypti from Kg. Banjar were susceptible to temephos with 93.3 (OS 2) and 100 (OS 3) mortality. The 50 mortality at lethal time (LT50) for all strains of Ae. aegypti and Ae. albopictus tested against operational dosage of temephos showed range between 36.07 to 75.69 minutes and 58.65 to 112.50 minutes, respectively, and complete mortality was achieved after 24 hours. Our results indicated that there is weekly variations of the resistance status for Ae. aegypti and Ae. albopictus. Aedes susceptibility to temephos is changing from time to time in these two study sites. It is essential to continue monitoring the resistance of this vector to insecticides in order to ensure the efficiency of program aimed at vector control and protection of human health.

Item Type: Article
Uncontrolled Keywords: insecticide temefos Aedes animal article bioassay classification dengue disease carrier disease transmission drug effect growth, development and aging human insecticide resistance larva Malaysia Animals Biological Assay Humans Insect Vectors Insecticides
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: miss munirah saadom
Date Deposited: 13 Jan 2013 13:36
Last Modified: 04 Dec 2019 08:56
URI: http://eprints.um.edu.my/id/eprint/5830

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