[01] Van Nguyen Do, Institude of Malariology, Parasiology and Entomology of Quy Nhon, Quy Nhon City, Viet Nam. [02] Xuan Quang Nguyen, Institude of Malariology, Parasiology and Entomology of Quy Nhon, Quy Nhon City, Viet Nam. [03] Hong Quang Huynh, Institude of Malariology, Parasiology and Entomology of Quy Nhon, Quy Nhon City, Viet Nam. [04] Thi Mong Diep Nguyen, Faculty of Biology-Agricultural Engineering, University of Quy Nhon, Quy Nhon City, Viet Nam.

The mosquitoes Aedes aegypti and Aedes albopictus are the two main vectors of viruses causing dengue, yellow fever, chikungunya and Zika in human. These diseases were prevalent in tropical and subtropical areas of the world. Three of these diseases (dengue, chikungunya and Zika) were identified in Viet Nam, among which dengue is the most common mosquito-borne viral disease with about 70,000-80,000 cases every year. There is currently no commercial vaccine or specific antiviral drug treatment for dengue, chikungunya or zika infections. The fight against these three diseases is therefore based on the control of their vectors, Aedes aegypti and Aedes albopictus, with insecticides. Several classes of pyrethroid insecticides are widely used to control adult Aedes mosquitoes, especially during diseases outbreaks. This study was conducted to provide information on the susceptibility status of Aedes aegypti and Aedes albopictus against insecticides in different types of landscape of Gia Lai and Binh Dinh provinces, in Central West Highland, in 2017. Samples of Aedes larvae and pupae were collected from breeding sites in various containers; both indoors and outdoors; including buckets, jars, flower plots, cement cisterns, discarded tyres and tanks. The collected larvae were transferred to the insectary of Entomology Department and Aedes aegypti and Aedes albopictus adults were then obtained from F1 generation and fed with 10% glucose before being used for insecticide susceptibility tests by the standard WHO test kit method. Susceptibility test was conducted on adult mosquitoes using paper impregnated with 30mg/m² alphacypermethrin or 0.05% lambdacyhalothrin or 0.05% deltamethrine or 0.75% permethrin or 5% malathion. The WHO diagnostic test kit was used following standard procedure. The final mosquito mortality was determined after 24h exposure time. The results demonstrate that Aedes aegypti and Aedes albopictus in all the study sites were resistant to lambdacyhalothrin, deltamethrin, permethrin and alphacypermethrin. In contrast, both Aedes aegypti and Aedes albopictus were found sensitive to malathion with 100% mortality rate in all sites of both provinces.

Aedes Aegypti, Aedes Albopictus, Diseases Vectors, Insecticide, Resistance

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