A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle

Autores
Fuentes, Mariana Elisabet; Lloberas, Maria Mercedes; Luque, Sonia Elisabet; Bernat, Gisele; Riva, Eliana; Fiel, Cesar Alberto; Fernández, Alicia Silvina
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Anthelmintic resistance in beef cattle production is a well-known worldwide problem, contributing to the economic losses caused by gastrointestinal nematodes. Resistance to ivermectin (IVM) is present in 93.5% of farms in Argentina, Cooperia spp. being the most prevalent genus (100%). Diagnosing AR under field conditions is currently done using the faecal egg count reduction test, which has been long used but lacks sensitivity to detect resistance in its early stages. In trying to improve this, in vitro techniques have been developed for different compounds and different parasites, and tested mainly in sheep parasites. As part of a large study on IVM-resistant populations of Cooperia spp. in beef farms, this assay was designed to evaluate two in vitro techniques, the micro-agar larval development test (MALDT) and the larval migration inhibition test (LMIT), on proven resistant (R) and susceptible (S) field populations. Both populations had been previously characterised by controlled-efficacy tests, showing that the efficacy of ivermectin against R and Se Cooperia was 66.3% and 99.5%, respectively. For the MALDT, eggs of both Cooperia isolates were exposed to twelve anthelmintic concentrations, from 4.7x10⁻¹⁰M to 2.18x10⁻¹¹M. The obtained EC50 values were: 6.93x10-9M (95%CI: 6.37x10⁻⁹M to 7.49x10⁻⁹M) for the R population and 8.33x10-10M (95%CI: 7.86x10⁻¹⁰M to 8.8x10⁻¹⁰M) for the S one, with correlation coefficients (R²) of 0.92 y 0.93, respectively; the resistance factor (RF) was 8.31. For the LMIT, ensheathed L3 were exposed to eight concentrations, from 10⁻⁵M a 5x10⁻⁹M. The EC50 values were 6.33x10-8M (95%CI: 5.30x10-8M to 7.49x10-8M) for the R population, and 8.03x10-8M (95%CI: 5.49x10-8M ? 1,19x10-7M) for the S population, with R² of 0.87 y 0.52, respectively; and a RF of 0.79. Based on these preliminary results, the MALDT would be a useful in vitro technique to detect field populations of IVM-resistant Cooperia nematodes.
Fil: Fuentes, Mariana Elisabet. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Lloberas, Maria Mercedes. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Luque, Sonia Elisabet. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Bernat, Gisele. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Riva, Eliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Fiel, Cesar Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Fernández, Alicia Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
28th Conference of the World Association for the Advancement of Veterinary Parasitology
Irlanda
University College Dublin
Trinity College Dublin
Queen’s University Belfast
Materia
IN VITRO TECHNIQUES
IVERMECTIN
RESISTANCE
COOPERIA
CATTLE
LARVAL DEVELOPMENT TEST
LARVAL MIGRATION INHIBITION TEST
GASTROINTESTINAL NEMATODES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/155890
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/155890
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattleFuentes, Mariana ElisabetLloberas, Maria MercedesLuque, Sonia ElisabetBernat, GiseleRiva, ElianaFiel, Cesar AlbertoFernández, Alicia SilvinaIN VITRO TECHNIQUESIVERMECTINRESISTANCECOOPERIACATTLELARVAL DEVELOPMENT TESTLARVAL MIGRATION INHIBITION TESTGASTROINTESTINAL NEMATODEShttps://purl.org/becyt/ford/4.3https://purl.org/becyt/ford/4https://purl.org/becyt/ford/4.2https://purl.org/becyt/ford/4Anthelmintic resistance in beef cattle production is a well-known worldwide problem, contributing to the economic losses caused by gastrointestinal nematodes. Resistance to ivermectin (IVM) is present in 93.5% of farms in Argentina, Cooperia spp. being the most prevalent genus (100%). Diagnosing AR under field conditions is currently done using the faecal egg count reduction test, which has been long used but lacks sensitivity to detect resistance in its early stages. In trying to improve this, in vitro techniques have been developed for different compounds and different parasites, and tested mainly in sheep parasites. As part of a large study on IVM-resistant populations of Cooperia spp. in beef farms, this assay was designed to evaluate two in vitro techniques, the micro-agar larval development test (MALDT) and the larval migration inhibition test (LMIT), on proven resistant (R) and susceptible (S) field populations. Both populations had been previously characterised by controlled-efficacy tests, showing that the efficacy of ivermectin against R and Se Cooperia was 66.3% and 99.5%, respectively. For the MALDT, eggs of both Cooperia isolates were exposed to twelve anthelmintic concentrations, from 4.7x10⁻¹⁰M to 2.18x10⁻¹¹M. The obtained EC50 values were: 6.93x10-9M (95%CI: 6.37x10⁻⁹M to 7.49x10⁻⁹M) for the R population and 8.33x10-10M (95%CI: 7.86x10⁻¹⁰M to 8.8x10⁻¹⁰M) for the S one, with correlation coefficients (R²) of 0.92 y 0.93, respectively; the resistance factor (RF) was 8.31. For the LMIT, ensheathed L3 were exposed to eight concentrations, from 10⁻⁵M a 5x10⁻⁹M. The EC50 values were 6.33x10-8M (95%CI: 5.30x10-8M to 7.49x10-8M) for the R population, and 8.03x10-8M (95%CI: 5.49x10-8M ? 1,19x10-7M) for the S population, with R² of 0.87 y 0.52, respectively; and a RF of 0.79. Based on these preliminary results, the MALDT would be a useful in vitro technique to detect field populations of IVM-resistant Cooperia nematodes.Fil: Fuentes, Mariana Elisabet. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; ArgentinaFil: Lloberas, Maria Mercedes. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; ArgentinaFil: Luque, Sonia Elisabet. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; ArgentinaFil: Bernat, Gisele. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; ArgentinaFil: Riva, Eliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; ArgentinaFil: Fiel, Cesar Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; ArgentinaFil: Fernández, Alicia Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina28th Conference of the World Association for the Advancement of Veterinary ParasitologyIrlandaUniversity College DublinTrinity College DublinQueen’s University BelfastUniversity College Dublin2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectConferenciaBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/155890A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle; 28th Conference of the World Association for the Advancement of Veterinary Parasitology; Irlanda; 2021; 1-2CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.waavp2021.com/wp-content/uploads/2021/08/WAAVP-2021-Abstract-book-22.07.21-FINAL.pdfinfo:eu-repo/semantics/altIdentifier/url/http://www.waavp2021.com/Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:15:07Zoai:ri.conicet.gov.ar:11336/155890instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:15:07.256CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
title A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
spellingShingle A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
Fuentes, Mariana Elisabet
IN VITRO TECHNIQUES
IVERMECTIN
RESISTANCE
COOPERIA
CATTLE
LARVAL DEVELOPMENT TEST
LARVAL MIGRATION INHIBITION TEST
GASTROINTESTINAL NEMATODES
title_short A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
title_full A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
title_fullStr A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
title_full_unstemmed A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
title_sort A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle
dc.creator.none.fl_str_mv Fuentes, Mariana Elisabet
Lloberas, Maria Mercedes
Luque, Sonia Elisabet
Bernat, Gisele
Riva, Eliana
Fiel, Cesar Alberto
Fernández, Alicia Silvina
author Fuentes, Mariana Elisabet
author_facet Fuentes, Mariana Elisabet
Lloberas, Maria Mercedes
Luque, Sonia Elisabet
Bernat, Gisele
Riva, Eliana
Fiel, Cesar Alberto
Fernández, Alicia Silvina
author_role author
author2 Lloberas, Maria Mercedes
Luque, Sonia Elisabet
Bernat, Gisele
Riva, Eliana
Fiel, Cesar Alberto
Fernández, Alicia Silvina
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv IN VITRO TECHNIQUES
IVERMECTIN
RESISTANCE
COOPERIA
CATTLE
LARVAL DEVELOPMENT TEST
LARVAL MIGRATION INHIBITION TEST
GASTROINTESTINAL NEMATODES
topic IN VITRO TECHNIQUES
IVERMECTIN
RESISTANCE
COOPERIA
CATTLE
LARVAL DEVELOPMENT TEST
LARVAL MIGRATION INHIBITION TEST
GASTROINTESTINAL NEMATODES
purl_subject.fl_str_mv https://purl.org/becyt/ford/4.3
https://purl.org/becyt/ford/4
https://purl.org/becyt/ford/4.2
https://purl.org/becyt/ford/4
dc.description.none.fl_txt_mv Anthelmintic resistance in beef cattle production is a well-known worldwide problem, contributing to the economic losses caused by gastrointestinal nematodes. Resistance to ivermectin (IVM) is present in 93.5% of farms in Argentina, Cooperia spp. being the most prevalent genus (100%). Diagnosing AR under field conditions is currently done using the faecal egg count reduction test, which has been long used but lacks sensitivity to detect resistance in its early stages. In trying to improve this, in vitro techniques have been developed for different compounds and different parasites, and tested mainly in sheep parasites. As part of a large study on IVM-resistant populations of Cooperia spp. in beef farms, this assay was designed to evaluate two in vitro techniques, the micro-agar larval development test (MALDT) and the larval migration inhibition test (LMIT), on proven resistant (R) and susceptible (S) field populations. Both populations had been previously characterised by controlled-efficacy tests, showing that the efficacy of ivermectin against R and Se Cooperia was 66.3% and 99.5%, respectively. For the MALDT, eggs of both Cooperia isolates were exposed to twelve anthelmintic concentrations, from 4.7x10⁻¹⁰M to 2.18x10⁻¹¹M. The obtained EC50 values were: 6.93x10-9M (95%CI: 6.37x10⁻⁹M to 7.49x10⁻⁹M) for the R population and 8.33x10-10M (95%CI: 7.86x10⁻¹⁰M to 8.8x10⁻¹⁰M) for the S one, with correlation coefficients (R²) of 0.92 y 0.93, respectively; the resistance factor (RF) was 8.31. For the LMIT, ensheathed L3 were exposed to eight concentrations, from 10⁻⁵M a 5x10⁻⁹M. The EC50 values were 6.33x10-8M (95%CI: 5.30x10-8M to 7.49x10-8M) for the R population, and 8.03x10-8M (95%CI: 5.49x10-8M ? 1,19x10-7M) for the S population, with R² of 0.87 y 0.52, respectively; and a RF of 0.79. Based on these preliminary results, the MALDT would be a useful in vitro technique to detect field populations of IVM-resistant Cooperia nematodes.
Fil: Fuentes, Mariana Elisabet. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Lloberas, Maria Mercedes. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Luque, Sonia Elisabet. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Sur. Estación Experimental Agropecuaria Balcarce; Argentina
Fil: Bernat, Gisele. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Riva, Eliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Fiel, Cesar Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
Fil: Fernández, Alicia Silvina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Centro de Investigación Veterinaria de Tandil. Universidad Nacional del Centro de la Provincia de Buenos Aires. Centro de Investigación Veterinaria de Tandil. Provincia de Buenos Aires. Gobernación. Comision de Investigaciones Científicas. Centro de Investigación Veterinaria de Tandil; Argentina
28th Conference of the World Association for the Advancement of Veterinary Parasitology
Irlanda
University College Dublin
Trinity College Dublin
Queen’s University Belfast
description Anthelmintic resistance in beef cattle production is a well-known worldwide problem, contributing to the economic losses caused by gastrointestinal nematodes. Resistance to ivermectin (IVM) is present in 93.5% of farms in Argentina, Cooperia spp. being the most prevalent genus (100%). Diagnosing AR under field conditions is currently done using the faecal egg count reduction test, which has been long used but lacks sensitivity to detect resistance in its early stages. In trying to improve this, in vitro techniques have been developed for different compounds and different parasites, and tested mainly in sheep parasites. As part of a large study on IVM-resistant populations of Cooperia spp. in beef farms, this assay was designed to evaluate two in vitro techniques, the micro-agar larval development test (MALDT) and the larval migration inhibition test (LMIT), on proven resistant (R) and susceptible (S) field populations. Both populations had been previously characterised by controlled-efficacy tests, showing that the efficacy of ivermectin against R and Se Cooperia was 66.3% and 99.5%, respectively. For the MALDT, eggs of both Cooperia isolates were exposed to twelve anthelmintic concentrations, from 4.7x10⁻¹⁰M to 2.18x10⁻¹¹M. The obtained EC50 values were: 6.93x10-9M (95%CI: 6.37x10⁻⁹M to 7.49x10⁻⁹M) for the R population and 8.33x10-10M (95%CI: 7.86x10⁻¹⁰M to 8.8x10⁻¹⁰M) for the S one, with correlation coefficients (R²) of 0.92 y 0.93, respectively; the resistance factor (RF) was 8.31. For the LMIT, ensheathed L3 were exposed to eight concentrations, from 10⁻⁵M a 5x10⁻⁹M. The EC50 values were 6.33x10-8M (95%CI: 5.30x10-8M to 7.49x10-8M) for the R population, and 8.03x10-8M (95%CI: 5.49x10-8M ? 1,19x10-7M) for the S population, with R² of 0.87 y 0.52, respectively; and a RF of 0.79. Based on these preliminary results, the MALDT would be a useful in vitro technique to detect field populations of IVM-resistant Cooperia nematodes.
publishDate 2021
dc.date.none.fl_str_mv 2021
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A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle; 28th Conference of the World Association for the Advancement of Veterinary Parasitology; Irlanda; 2021; 1-2
CONICET Digital
CONICET
url http://hdl.handle.net/11336/155890
identifier_str_mv A comparison between two in vitro techniques to detect resistance to ivermectin in field populations of Cooperia spp. in cattle; 28th Conference of the World Association for the Advancement of Veterinary Parasitology; Irlanda; 2021; 1-2
CONICET Digital
CONICET
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