The emergence of insecticide resistance in Aedes against pyrethroid group has become a threat to the vector control program. This study investigates the
resistance status and the presence of F1534C kdr mutations in Aedes albopictus populations of Kota Bharu and Kubang Kerian, Kelantan, Malaysia. The F1 adults
of Ae. albopictus were assayed using World Health Organization (WHO) susceptibility test with 4% dichloro-diphenyl-trichloroethane (DDT), 0.05% lambda-cyhalothrin,
and 0.75% permethrin. For susceptibility analysis, the mortality percentage, 50% cumulative knockdown time (KT50), and resistance ratio (RR) values were calculated.
All the mosquito survivors were collected and subjected to the allele-specific polymerase chain reaction (AS-PCR) analysis on the presence of knockdown
resistance (kdr) mutation F1534C. Results show that Ae. albopictus from Kota Bharu was possible resistance to DDT and pyrethroids, while Ae. albopictus
in Kubang Kerian showed mixed resistant populations which are possible resistance and susceptibility to DDT and pyrethroids, respectively.
The kdr alleles F/C1534 were detected in both Ae. albopictus populations with higher heterozygote resistant alleles (F/C) in Kota Bharu.
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