Abstracts for the Annual Meetings of the Japan Society of Medical Entomology and Zoology

The present study was to determine the vertical distribution and abundance of Aedes mosquitoes in high rise apartment in Selangor State and Kuala Lumpur Federal Territory, Malaysia. Ovitrap surveillance was conducted for 4 continuous weeks in multiple storey buildings in 4 residential areas located in Selangor [Kg. Baiduri (KB)] and Kuala Lumpur[Student Hostel of University of Malaya (UM), Vista Angkasa (VA) and Hang Tuah (HT)]. The results implied that Aedes mosquitoes could be found from ground floor to highest floor of multiple storey buildings and data from different elevation did not show significant different. Ovitrap index for UM, KB, HT and VA ranged from 8.70—14.81%, 8.33—36.84%, 34.21—51.52% and 21.67—69.09%, respectively. Aedes aegypti and Ae.albopictus were found breeding in HT, VA and KB; while only Ae.albopictus　was obtained from UM. This study suggests that the invasion of Aedes mosquitoes in high-rise apartments could enhance the transmission of dengue virus and approach on vector control in this type of residential areas should be developed.

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A nationwide investigation was carried out to determine the current susceptibility status of Culex quinquefasciatus populations against four classes of insecticides: DDT, propoxur, malathion and permethrin. Tests were conducted in accordance to standard WHO mosquito larva and adult bioassay procedures. Across 14 study sites, a wide variation of insecticide resistance was developed in Malaysian Cx. quinquefasciatus in larva and adult . Both larval and adult bioassay exhibited dissimilar trend in susceptibility. Overall, the resistance status of Cx. quinquefasciatus larvae in descending order is: malathion (mean RR₅₀ = 6.33) > DDT (mean RR₅₀ = 2.31)>propoxur(mean RR₅₀ = 1.73) > permethrin (mean RR₅₀ = 1.65), whereas the resistance status of Cx. quinquefasciatus adults in descending order is: DDT (% mortality = 15.91) > propoxur (32.18%) > malathion (47.14%) > permethrin (75.67%). Statistical analysis indicated that there was a significant correlation between propoxur and malathion resistance (r = 0.780, p = 0.001) and between propoxur and permethrin resistance (r = 0.613, p = 0.020) in larval stage. The results obtained from this study provide baseline information for vector control programme conducted by local authorities. The susceptibility status of this mosquito should be monitored from time to time to ensure the effectiveness of vector control operations currently practised in Malaysia.

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