Abstract:
:IntroductionAedes albopictus (Skuse) is an important vector of arboviral diseases, including dengue, chikungunya and Zika virus disease. Monitoring insecticide resistance and mechanisms by which the mosquito develops resistance is crucial to minimise disease transmission.AimTo determine insecticide resistance status and mechanisms in Ae. albopictus from different geographical regions.MethodsWe sampled 33 populations of Ae. albopictus from Asia, Europe and South America, and tested these for susceptibility to permethrin, a pyrethroid insecticide. In resistant populations, the target site for pyrethroids, a voltage-sensitive sodium channel (Vssc) was genotyped. Three resistant sub-strains, each harbouring a resistance allele homozygously, were established and susceptibilities to three different pyrethroids (with and without a cytochrome P450 inhibitor) were assayed.ResultsMost populations of Ae. albopictus tested were highly susceptible to permethrin but a few from Italy and Vietnam (4/33), exhibited high-level resistance. Genotyping studies detected a knockdown resistance (kdr) allele V1016G in Vssc for the first time in Ae. albopictus. Two previously reported kdr alleles, F1534C and F1534S, were also detected. The bioassays indicated that the strain homozygous for the V1016G allele showed much greater levels of pyrethroid resistance than other strains harbouring F1534C or F1534S.ConclusionThe V1016G allele was detected in bothAsian and Italian Ae. albopictus populations, thus a spread of this allele beyond Italy in Europe cannot be ruled out. This study emphasises the necessity to frequently and regularly monitor the V1016G allele in Ae. albopictus, particularly where this mosquito species is the main vector of arboviruses.
journal_name
Euro Surveilljournal_title
Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletinauthors
Kasai S,Caputo B,Tsunoda T,Cuong TC,Maekawa Y,Lam-Phua SG,Pichler V,Itokawa K,Murota K,Komagata O,Yoshida C,Chung HH,Bellini R,Tsuda Y,Teng HJ,Filho JLL,Alves LC,Ng LC,Minakawa N,Yen NT,Phong TV,Sawabe K,Tomitdoi
10.2807/1560-7917.ES.2019.24.5.1700847subject
Has Abstractpub_date
2019-01-01 00:00:00issue
5eissn
1025-496Xissn
1560-7917journal_volume
24pub_type
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