Resultado da pesquisa (4)

Termo utilizado na pesquisa Fipronil

#1 - Susceptibility of field populations of Haematobia irritans to fipronil in Uruguay

Abstract in English:

Fipronil was registered in Uruguay in 1997, and, since then, it has been used for the control of Haematobia irritans irritans and Rhipicephalus microplus. The susceptibility of H. irritants to this drug has not been evaluated. Therefore, the goal of the present study was to evaluate the resistance of H. irritans to fipronil. Additionally, a survey was carried out with the farmers to evaluate the use of fipronil for H. irritans control in the ranches where the flies came from. For the bioassays, 31 field populations of H. irritans were exposed to 10 concentrations of fipronil (3.2-16.0μg.cm2), and their LC50 values were calculated using probit analysis. A bioassay was performed with horn flies from the susceptible colony maintained at the USDA-ARS Knipling-Bushland U.S. Livestock Insects Research Laboratory for comparison and calculation of resistance ratios (RRs). All 31 field populations surveyed in the study were susceptible to fipronil, with resistance ratios ranging from <0.5 to 2.2. Four populations with RRs >1 did not differ significantly from the susceptible strain. A single population showed an RR >2.2. Overall, the survey shows that fipronil was mostly used for R. microplus control, and in only three ranches, which were free of R. microplus, was fipronil used for horn fly control. Seventeen farmers did not use fipronil at all in the last three years. It is concluded that, in Uruguay, field populations of horn flies remain susceptible to fipronil.

Abstract in Portuguese:

O fipronil foi registrado no Uruguai em 1997 e, desde então, tem sido utilizado no controle de Haematobia irritans irritans e Rhipicephalus microplus. O objetivo do presente estudo foi avaliar a susceptibilidade de populações de campo de H. irritans ao fipronil. Além disso, foi realizada uma pesquisa para avaliar a utilização de fipronil e as práticas de controle de H. irritans nas fazendas de onde provinham as moscas. Para os bioensaios, 31 populações de campo de H. irritans foram expostas a 10 concentrações de fipronil (3,2-16,0μg.cm2), e seus valores de CL50 foram calculados usando análise probit. Um bioensaio foi realizado com H. irritans da colônia suscetível mantida no USDA-ARS Knipling-Bushland U.S. Livestock Insects Research Laboratory para comparação e cálculo das razões de resistência (RRs). Todas as 31 populações de campo pesquisadas no estudo eram suscetíveis ao fipronil, com taxas de resistência variando de <0,5 à 2,2. Quatro populações com Rrs >1 não diferiram significativamente da cepa suscetível. Uma única população apresentou RR >2,2. No geral, o fipronil tinha sido usado principalmente para o controle de R. microplus, e em apenas três fazendas, que estavam livres de R. microplus, o fipronil era utilizado para o controle da H. irritans. Em 17 fazendas não tinha sido utilizado fipronil nos últimos três anos. Conclui-se que no Uruguai as populações de H. irritans no campo permanecem suscetíveis ao fipronil.


#2 - Fipronil/(S)-methoprene spot-on to control fleas on cats in a field trial in Spain, 37(6):603-607

Abstract in English:

ABSTRACT.- Gracia M.J., Calvete C., Estrada R., Marcén J.M., Pinal R. & Peribáñez M.A. 2017. Fipronil/(S)-methoprene spot-on to control fleas on cats in a field trial in Spain. Pesquisa Veterinária Brasileira 37(6):603-607. Departamento de Patología Animal, Parasitología, Facultad de Veterinaria, Calle Miguel Servet 177, 50013 Zaragoza, España. E-mail: mjgracia@unizar.es The study was conducted in order to evaluate the effect of a fipronil/(S)-methoprene formulation against fleas on naturally infested cats. The study involved a population of 89 cats distributed among 24 veterinary practices in 9 regions of Spain. The product was applied according to label instructions on days 0, 30 and 60. Animals underwent parasitological and clinical assessments on day 0 and thereafter in monthly intervals (every 30 days) until day 90. Ctenocephalides felis was the most abundant species (98.9% of all fleas collected), and flea abundance on Day 0 was associated with the hair type, the location of the household, and the time elapsed from the last anti-flea treatment. Fipronil/(S)-methoprene demonstrated high efficacy and induced the reduction of clinical signs related to the presence of fleas. Clinical signs and flea abundance decreased significantly throughout time (P=0.001) with an efficacy rate of 72.6% at Day 30, 88.4% at Day 60 and 93.9% at Day 90. A high level of flea control and a remission of the clinical signs related to presence of fleas were observed on cats following 3 monthly applications a fipronil/(S)-methoprene formulation.

Abstract in Portuguese:

ABSTRACT.- Gracia M.J., Calvete C., Estrada R., Marcén J.M., Pinal R. & Peribáñez M.A. 2017. Fipronil/(S)-methoprene spot-on to control fleas on cats in a field trial in Spain. Pesquisa Veterinária Brasileira 37(6):603-607. Departamento de Patología Animal, Parasitología, Facultad de Veterinaria, Calle Miguel Servet 177, 50013 Zaragoza, España. E-mail: mjgracia@unizar.es The study was conducted in order to evaluate the effect of a fipronil/(S)-methoprene formulation against fleas on naturally infested cats. The study involved a population of 89 cats distributed among 24 veterinary practices in 9 regions of Spain. The product was applied according to label instructions on days 0, 30 and 60. Animals underwent parasitological and clinical assessments on day 0 and thereafter in monthly intervals (every 30 days) until day 90. Ctenocephalides felis was the most abundant species (98.9% of all fleas collected), and flea abundance on Day 0 was associated with the hair type, the location of the household, and the time elapsed from the last anti-flea treatment. Fipronil/(S)-methoprene demonstrated high efficacy and induced the reduction of clinical signs related to the presence of fleas. Clinical signs and flea abundance decreased significantly throughout time (P=0.001) with an efficacy rate of 72.6% at Day 30, 88.4% at Day 60 and 93.9% at Day 90. A high level of flea control and a remission of the clinical signs related to presence of fleas were observed on cats following 3 monthly applications a fipronil/(S)-methoprene formulation.


#3 - Genotoxicity assessment of fipronil (frontline plus®) in Canis familiaris, 37(3):257-260

Abstract in English:

ABSTRACT.- Ziliotto L., Luna S.P.L., Filho D.A.A., Resende L.O., Aun A.G. & Braz M.G. 2017. Genotoxicity assessment of fipronil (frontline plus®) in Canis familiaris. [Avaliação de genotoxicidade do fipronil (frontline plus®) in cães.] Pesquisa Veterinária Brasileira 37(3):257-260. Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Avenida. Prof. Mário Rubens Guimarães Montenegro s/n, Botucatu, SP 18618-687, Brazil. E-mail: mgbraz@hotmail.com Fipronil is a pesticide widely used for controlling fleas and ticks in domestic animals, and its short-term exposure can lead to serious effects on animals. However, the possible genotoxic effect of this compound has not been investigated in target animals. Based on the hypothesis that fipronil can induce genotoxicity, this study evaluated the effect of fipronil on DNA damage in peripheral blood cells. For that purpose, ten dogs of both sexes were used in the study. The product (6.7mg/kg) was applied on the dorsal neck region of each animal. Peripheral blood samples were collected immediately prior to application of the product, and at 3, 8 and 24 hours after the application. Samples were processed for comet assay. No statistically significant differences were found among the four time points. The current study suggests for the first time that a single exposure to this pesticide does not induce systemic genotoxic effect in dogs.

Abstract in Portuguese:

RESUMO.- Ziliotto L., Luna S.P.L., Filho D.A.A., Resende L.O., Aun A.G. & Braz M.G. 2017. Genotoxicity assessment of fipronil (frontline plus®) in Canis familiaris. Pesquisa Veterinária Brasileira 37(3):257-260. Faculdade de Medicina de Botucatu, Universidade Estadual Paulista, Avenida. Prof. Mário Rubens Guimarães Montenegro s/n, Botucatu, SP 18618-687, Brazil. E-mail: mgbraz@hotmail.com O fipronil é um inseticida/herbicida amplamente utilizado para controle de pulgas e carrapatos em animais domésticos. Sua exposição a curto prazo tem acarretado efeitos deletérios em animais. Entretanto, o possível efeito genotóxico deste composto ainda não foi investigado em animais alvo. Baseando-se na hipótese de que o fipronil pode induzir genotoxicidade, o presente estudo avaliou o efeito deletério do fipronil no material genético de células de sangue periférico. Para isso, dez cães sadios, de ambos os sexos, foram utilizados neste estudo. O produto (6,7mg/kg) foi aplicado na região dorsal do pescoço de cada animal. As amostras de sangue foram coletadas imediatamente antes da aplicação do produto (controle) e após três, oito e 24 horas da aplicação. As amostras foram imediatamente processadas para condução do teste do cometa, a fim de se avaliar os danos basais no DNA. Não houve diferença significativa entre os quatro momentos de coleta em relação aos danos no material genético. O estudo sugere, pela primeira vez, que uma exposição única a este pesticida não induz efeito genotóxico sistêmico em cães.


#4 - Efficacy of fipronil for dogs with different parasite burdens of Ctenocephalides felis felis (Siphonaptera: Pulicidae), 35(3):270-273

Abstract in English:

ABSTRACT.- Coelho C.N., Batista L.C.S.O., Lambert M.M., Nunes T.A.P., Santos R.R., Silva D.D., Correia T.R. & Scott F.B. 2015. [Efficacy of fipronil for dogs with different parasite burdens of Ctenocephalides felis felis (Siphonaptera: Pulicidae).] Eficácia do fipronil em cães infestados com diferentes cargas parasitárias de Ctenocephalides felis felis (Siphonaptera: Pulicidae). Pesquisa Veterinária Brasileira 35(3):270-273. Programa de Pós-Graduação em Ciências Ve­terinárias, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, BR-465 Km 7, Seropédica, RJ 23897-970, Brazil. E-mail: cnunesc@hotmail.com The objective of the study was to evaluate through in vivo test, the efficacy and residual period of protection of 10% fipronil “top spot” for dogs with different Ctenocephalides felis felis burdens of infestations. For this, 24 Beagles were used, divided into four groups of six dogs each. The dogs of the control groups I and II were not treated, while the dogs of the treated groups I e II were treated with the formulation of 10% fipronil “top spot”. The dogs of the control group I and treated group I were infested with 100 unfed C. felis felis and dogs of group control II and treated II one were infested with 300 unfed C. felis felis each. Infestations were performed on days -2, +5, +12, +19, +26, +33 and +40, and on days +2, +7, +14, +21, +28, +35 and +42 fleas were mechanical removed and counted for evaluation. Efficacy for treated group I on days +2, +7, +14, +21, +28, +35 and +42 was respectively 99.36%, 99.73%, 99.48%, 99.00%, 74.00%, 99.75%, 95.06% and 67.62%. The efficacy for the treated group II, evaluated on the same days, was respectively 100%, 100%, 100%, 100%, 99.91, 95.60% and 68.55%. Fipronil was effective in eliminating fleas on dogs until day +35. The statistical comparisons of the mean living fleas between control I group and treated I one showed significant differences (p&#8804;0.05) for the challenges on all experimental days after treatment. Control II group and treated II one also showed significant differences (p&#8804;0.05) for the challenges on all experimental days after treatment. Statistical analysis between treated group I and II showed no significant difference (p&#8805;0.05) between the challenges on all experimental days. The challenges were finished on day 42, when the effectiveness of fipronil in treated groups I and II were lower than 70%. The tested product was effective in eliminating fleas on dogs until day + 35 with no more residual effect of protection when the animals were reinfested. There was no difference in efficacy levels between the groups infested with 100 and 300 specimens of C. felis felis throughout the experimental period.

Abstract in Portuguese:

RESUMO.- Coelho C.N., Batista L.C.S.O., Lambert M.M., Nunes T.A.P., Santos R.R., Silva D.D., Correia T.R. & Scott F.B. 2015. [Efficacy of fipronil for dogs with different parasite burdens of Ctenocephalides felis felis (Siphonaptera: Pulicidae).] Eficácia do fipronil em cães infestados com diferentes cargas parasitárias de Ctenocephalides felis felis (Siphonaptera: Pulicidae). Pesquisa Veterinária Brasileira 35(3):270-273. Programa de Pós-Graduação em Ciências Ve­terinárias, Instituto de Veterinária, Universidade Federal Rural do Rio de Janeiro, BR-465 Km 7, Seropédica, RJ 23897-970, Brazil. E-mail: cnunesc@hotmail.com O objetivo do trabalho foi avaliar através de teste in vivo, a eficácia e o período residual de proteção do fipronil 10% “top spot” em cães infestados com diferentes cargas parasitárias de Ctenocephalides felis felis. Foram utilizados 24 cães da raça Beagle, compondo seis animais por grupo. Os cães foram divididos em quatro grupos. Os cães dos grupos controles I e II não receberam tratamento, enquanto que os cães dos grupos tratados I e II receberam tratamento com formulação de fipronil 10% “top spot”. Os cães dos grupos controle I e tratado I foram infestados com 100 pulgas adultas não alimentadas, e os cães dos grupos controle II e tratado II foram infestados com 300 pulgas adultas não alimentadas. As infestações foram realizadas nos dias, -2, +5, +12, +19, +26, +33 e +40 e nos dias +2, +7, +14, +21, +28, +35 e +42 foi realizada retirada mecânica e contagem de pulgas para avaliação. As eficácias pulguicidas, para o grupo tratado I, nos dias +2, +7, +14, +21, +28, +35 e +42, foram respectivamente 99,36%; 99,73%; 99,48%; 99,74%; 99,75%; 95,06% e 67,62%. As eficácias pulguicidas, para o grupo tratado II, avaliadas nos mesmos dias, foram respectivamente 100%; 100%; 100%; 100%; 99,91%; 95,60% e 68,55%. O fipronil mostrou-se eficaz na eliminação das pulgas em cães até o dia +35. A análise estatística comparativa entre as médias de pulgas vivas, entre os grupos controle I e tratado I, demonstrou que ocorreu diferença significativa (p&#8804;0,05) para os desafios em todos os dias experimentais, após o tratamento. Os grupos controle II e tratado II também apresentaram diferença significativa (p&#8804;0,05) para os desafios em todos os dias experimentais, após o tratamento. A análise estatística entre os grupos tratados I e II demonstrou que não ocorreu diferença significativa (p&#8805;0,05) para os desafios em todos os dias experimentais. O desafio foi encerrado no dia +42 já que a eficácia do fipronil nos grupos tratados I e II foram inferiores 70%. O produto em teste mostrou-se eficaz na eliminação das pulgas em cães até o dia + 35, não apresentando mais efeito residual de proteção quando os animais foram reinfestados. Não houve diferença significativa nos níveis de eficácia entre os grupos infestados com 100 e 300 exemplares adultos de C. felis felis ao longo do período experimental.


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