Fitness evaluation of two Brazilian Aedes aegypti field populations with distinct levels of resistance to the organophosphate temephos

dc.creatorBelinato, Thiago Affonso
dc.creatorMartins, Ademir Jesus
dc.creatorValle, Denise
dc.date2018-11-08T10:40:06Z
dc.date2018-11-08T10:40:06Z
dc.date2012
dc.date.accessioned2023-09-27T00:14:58Z
dc.date.available2023-09-27T00:14:58Z
dc.identifierBELINATTO, Thiago Affonso; MARTINS, Ademir Jesus; VALLE, Denise. Fitness evaluation of two Brazilian Aedes aegypti field populations with distinct levels of resistance to the organophosphate temephos. Mem Inst Oswaldo Cruz, v.107, n.7, p.916-922, Nov. 2012.
dc.identifier0074-0276
dc.identifierhttps://www.arca.fiocruz.br/handle/icict/29927
dc.identifier1678-8060
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8898942
dc.descriptionIn Brazil, decades of dengue vector control using organophosphates and pyrethroids have led to dissemination of resistance. Although these insecticides have been employed for decades against Aedes aegypti in the country, knowledge of the impact of temephos resistance on vector viability is limited. We evaluated several fitness parameters in two Brazilian Ae. aegypti populations, both classified as deltamethrin resistant but with distinct resistant ratios (RR) for temephos. The insecticide-susceptible Rockefeller strain was used as an experimental control. The population presenting the higher temephos resistance level, Aparecida de Goiânia, state of Goiás (RR95 of 19.2), exhibited deficiency in the following four parameters: blood meal acceptance, amount of ingested blood, number of eggs and frequency of inseminated females. Mosquitoes from Boa Vista, state of Roraima, the population with lower temephos resistance level (RR95 of 7.4), presented impairment in only two parameters, blood meal acceptance and frequency of inseminated females. These results indicate that the overall fitness handicap was proportional to temephos resistance levels. However, it is unlikely that these disabilities can be attributed solely to temephos resistance, since both populations are also resistant to deltamethrin and harbour the kdr allele, which indicates resistance to pyrethroids. The effects of reduced fitness in resistant populations are discussed.
dc.formatapplication/pdf
dc.languageeng
dc.publisherFundação Oswaldo Cruz. Instituto Oswaldo Cruz
dc.rightsopen access
dc.subjectAedes aegypti
dc.subjectTemefós
dc.subjectGinástica
dc.subjectResistência a Inseticidas
dc.subjectAedes aegypti
dc.subjectinsecticide resistance
dc.subjecttemephos
dc.subjectFitness
dc.titleFitness evaluation of two Brazilian Aedes aegypti field populations with distinct levels of resistance to the organophosphate temephos
dc.typeArticle


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