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Abstract
Resistance to ivermectin in populations of the cattle tick Rhipicephalus microplus in Argentina was diagnosed in this work. The in vitro larval immersion test (LIT) was used to determine quantitatively the levels of resistance to ivermectin in different populations of R. microplus. Additionally, field trials to control natural infestations of R. microplus on cattle with a commercial formulation of ivermectin 3.15% were carried and jointly analyzed with [ver mas...]
dc.contributor.authorTorrents, Jorgelina
dc.contributor.authorSarli, Macarena
dc.contributor.authorRossner, Maria Victoria
dc.contributor.authorToffaletti, Jose Rodolfo
dc.contributor.authorMorel, Nicolas
dc.contributor.authorMartinez, Norberto Claudio
dc.contributor.authorWebster, Anelise
dc.contributor.authorMangold, Atilio Jose
dc.contributor.authorGuglielmone, Alberto
dc.contributor.authorNava, Santiago
dc.date.accessioned2020-08-19T12:28:21Z
dc.date.available2020-08-19T12:28:21Z
dc.date.issued2020
dc.identifier.issn0034-5288
dc.identifier.otherhttps://doi.org/10.1016/j.rvsc.2020.07.012
dc.identifier.urihttp://hdl.handle.net/20.500.12123/7736
dc.identifier.urihttps://www.sciencedirect.com/science/article/abs/pii/S0034528820309255
dc.description.abstractResistance to ivermectin in populations of the cattle tick Rhipicephalus microplus in Argentina was diagnosed in this work. The in vitro larval immersion test (LIT) was used to determine quantitatively the levels of resistance to ivermectin in different populations of R. microplus. Additionally, field trials to control natural infestations of R. microplus on cattle with a commercial formulation of ivermectin 3.15% were carried and jointly analyzed with the in vitro assays. The phenotypic response of the populations analyzed was not uniform. Five of them were classified as susceptible, four populations as resistant, and one in the category “incipient resistance”. Regarding the field trials, the therapeutic efficacy in a population classified with LIT as susceptible achieved values higher than 94% two weeks after treatment, and no reproductively viable females were observed after the second day post-treatment. Conversely, the values of efficacy percentage in a population (named as “San Martín”) classified with LIT in the category “incipient resistance” never exceeded the 70.8%, and engorged females were collected in practically all counts. The population “San Martín” was classified in the category “incipient resistant” with LIT analysis, but the field trial unambiguously shows that this tick population is resistant. The comparison of the results obtained with LIT in vitro assays and through field trials shows that biased estimations of resistance levels may occur when resistance ratios (RR) values are ≤2, and additional field efficacy trials could be needed to know with precision the status of the tick populations evaluated.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherElsevieres_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceResearch in Veterinary Science 132 : 332-337 (October 2020)es_AR
dc.subjectGanado Bovinoes_AR
dc.subjectCattleeng
dc.subjectRhipicephaluses_AR
dc.subjectPlagas de Animaleses_AR
dc.subjectPests of Animalseng
dc.subjectControl de Plagases_AR
dc.subjectPest Controleng
dc.subjectIvermectinaes_AR
dc.subjectIvermectineng
dc.subjectResistencia a los Acaricidases_AR
dc.subjectResistance to Acaricideseng
dc.subjectArgentinaes_AR
dc.subject.otherGarrapatases_AR
dc.subject.otherRhipicephalus (Boophilus) micropluses_AR
dc.titleResistance of the cattle tick Rhipicephalus (Boophilus) microplus to ivermectin in Argentinaes_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Rafaelaes_AR
dc.description.filFil: Torrents, Jorgelina. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias; Argentinaes_AR
dc.description.filFil: Sarli, Macarena. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina.es_AR
dc.description.filFil: Rossner, Maria Victoria. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Colonia Benitez; Argentinaes_AR
dc.description.filFil: Toffaletti, Jose Rodolfo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria El Colorado; Argentinaes_AR
dc.description.filFil: Morel, Nicolas. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentinaes_AR
dc.description.filFil: Martinez, Norberto Claudio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Reconquista. Agencia De Extensión Rural Garabato; Argentinaes_AR
dc.description.filFil: Webster, Anelise. Instituto de Pesquisas Veterinárias Desidério Finamor; Brasiles_AR
dc.description.filFil: Mangold, Atilio Jose. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina.es_AR
dc.description.filFil: Guglielmone, Alberto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentinaes_AR
dc.description.filFil: Nava, Santiago. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.subtypecientifico


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