Susceptibility of Rhipicephalus (Boophilus) microplus to ivermectin (200, 500 and 630 mu g/kg) in field studies in Brazil

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dc.contributor.authorCruz, Breno Cayeiro [UNESP]
dc.contributor.authorZanetti Lopes, Welber Daniel [UNESP]
dc.contributor.authorMaciel, Willian Giquelin [UNESP]
dc.contributor.authorFelippelli, Gustavo [UNESP]
dc.contributor.authorFavero, Flavia Carolina [UNESP]
dc.contributor.authorPires Teixeira, Weslen Fabricio [UNESP]
dc.contributor.authorCarvalho, Rafael Silveira
dc.contributor.authorRuivo, Maycon Araujo
dc.contributor.authorAlcantara Colli, Marcos Henrique
dc.contributor.authorMassamitsu Sakamoto, Claudio Alessandro
dc.contributor.authorCosta, Alvimar Jose da [UNESP]
dc.contributor.authorDe Oliveira, Gilson Pereira [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de Goiás (UFG)
dc.contributor.institutionUniversidade Estadual de Maringá (UEM)
dc.date.accessioned2015-10-22T06:19:57Z
dc.date.available2015-10-22T06:19:57Z
dc.date.issued2015-01-30
dc.description.abstractThe present study aimed to determine the susceptibility of 17 Rhipicephalus (Boophilus) microplus populations, originating in the Southeast and Southern regions of Brazil, to different ivermectin concentrations (200, 500 and 630 mu g/kg), administered through subcutaneous or topical (pour-on) routes. R. (B.) microplus populations from the states of Minas Gerais (seven populations), Sao Paulo (seven populations) and Parana (three populations) were chosen for the tests. The selected cattle were allocated to treatment groups on day 0, and block formation was based on the arithmetic mean of female ticks (4.5-8.0 mm long) counted on three consecutive days (-3, -2 and -1). To evaluate the therapeutic and residual efficacies of these formulations, tick counts (females ranging from 4.5 to 8.0 mm long) were performed on days 3,7 and 14 post-treatment, and continued on a weekly basis thereafter until the end of each experiment. The results obtained throughout this study, utilizing field efficacy studies, allowed us to conclude that the resistance of R. (B.) microplus against 200 and 500 mu g/kg ivermectin is widely disseminated because all tick populations that had contact with these specific concentrations were diagnosed as resistant. However, it is possible to infer that R. (B.) microplus resistance against 630 mu g/kg ivermectin was also widespread, diagnosed at six of ten analyzed properties. Resistance of these ectoparasites to 630 mu g/kg ivermectin is most likely emerging in three other populations of R. (B.) microplus. Strategies of resistance management need to be quickly determined to keep the selection pressure at a minimum level in Brazil. (C) 2014 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniversidade Estadual Paulista (UNESP) - Faculdade de Ciências Agrárias e Veterinárias, Centro de Pesquisa de Saúde Animal, Campus de Jaboticabal, Jaboticabal, São Paulo, Brasil
dc.description.affiliationUniversidade Federal de Goiás, Parque Industrial Jataí, Goiás, Brasil
dc.description.affiliationUniversidade Estadual de Maringá, Campus Regional de Umuarama, Paraná, Brasil
dc.description.affiliationUnespUniversidade Estadual Paulista (UNESP) - Faculdade de Ciências Agrárias e Veterinárias, Centro de Pesquisa de Saúde Animal, Campus de Jaboticabal, Jaboticabal, São Paulo, Brasil
dc.format.extent309-317
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0304401714006463
dc.identifier.citationVeterinary Parasitology. Amsterdam: Elsevier Science Bv, v. 207, n. 3-4, p. 309-317, 2015.
dc.identifier.doi10.1016/j.vetpar.2014.12.012
dc.identifier.issn0304-4017
dc.identifier.urihttp://hdl.handle.net/11449/129632
dc.identifier.wosWOS:000349271100014
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofVeterinary Parasitology
dc.relation.ispartofjcr2.422
dc.relation.ispartofsjr1,275
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectAvermectinsen
dc.subjectCattleen
dc.subjectResistanceen
dc.subjectTicksen
dc.titleSusceptibility of Rhipicephalus (Boophilus) microplus to ivermectin (200, 500 and 630 mu g/kg) in field studies in Brazilen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes4587241487071929[11]
unesp.author.orcid0000-0001-7537-323X[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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