Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador

Background: Bovine leukemia virus (BLV) is the causative agent of enzootic bovine leukosis (EBL). This disease mainly affects cattle, causing severe economic losses to producers. Objective: To establish individual and herd seroprevalence and determine the risk factors associated with BLV seropositiv...

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Autores principales:	Luis R. Saa, Lucía T. Guzmán, Natacha C. Fierro, Luz M. Castro, Fabián Reyes-Bueno, Alfonso Carbonero
Formato:	article
Lenguaje:	EN
Publicado:	Universidad de Antioquia 2020
Materias:	blv bovine leukemia virus cattle cows ebl enzootic bovine leukosis epidemiology prevalence risk factors ruminant seroprevalence seropositivity virus Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/a5617eff609942f2a5ace549200d3102
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spelling	oai:doaj.org-article:a5617eff609942f2a5ace549200d31022021-12-01T15:02:45ZSeroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador2256-295810.17533/udea.rccp.v34n3a01https://doaj.org/article/a5617eff609942f2a5ace549200d31022020-08-01T00:00:00Zhttps://revistas.udea.edu.co/index.php/rccp/article/view/343552https://doaj.org/toc/2256-2958Background: Bovine leukemia virus (BLV) is the causative agent of enzootic bovine leukosis (EBL). This disease mainly affects cattle, causing severe economic losses to producers. Objective: To establish individual and herd seroprevalence and determine the risk factors associated with BLV seropositivity for dairy and dual-purpose cattle herds in Ecuador. Methods: A total of 2,668 serum samples from 386 herds were collected. A questionnaire, including variables related to cattle health, management and the environment was completed by each herd. A commercial blocking enzyme-linked immunosorbent assay (ELISA) test was used to determine seropositivity. A generalized estimating equation model (GEE) was developed to determine the factors associated with BLV seropositivity. Results: Individual seroprevalence of BLV infection in Ecuador was 17.3% (CI95% = 15.86-18.74%). Herd prevalence was 37.8% (CI95% = 33.0-42.6%), and intra-herd prevalence ranged between 12.5 and 100% (median: 37.5%). The risk factors associated with BLV seropositivity were artificial insemination (OR: 2,215; CI95% = 1.402-3.501), concrete floors (OR: 2.178; CI95% = 1.217-3.889), presence of wild ruminants (OR: 2.998; CI95% = 1.788-5.027), and sampling season (wet; OR: 1.996; CI95% = 1.140-3.497). Conclusions: Results indicate that BLV is widespread in cattle herds in Ecuador. In addition, the study suggests that a control program to fight BLV infection should focus on controlling the risk factors identified.Luis R. SaaLucía T. GuzmánNatacha C. FierroLuz M. CastroFabián Reyes-BuenoAlfonso CarboneroUniversidad de Antioquiaarticleblvbovine leukemia viruscattlecowseblenzootic bovine leukosisepidemiologyprevalencerisk factorsruminantseroprevalenceseropositivityvirusAnimal cultureSF1-1100ENRevista Colombiana de Ciencias Pecuarias, Vol 34, Iss 3, Pp 177-188 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	blv bovine leukemia virus cattle cows ebl enzootic bovine leukosis epidemiology prevalence risk factors ruminant seroprevalence seropositivity virus Animal culture SF1-1100
spellingShingle	blv bovine leukemia virus cattle cows ebl enzootic bovine leukosis epidemiology prevalence risk factors ruminant seroprevalence seropositivity virus Animal culture SF1-1100 Luis R. Saa Lucía T. Guzmán Natacha C. Fierro Luz M. Castro Fabián Reyes-Bueno Alfonso Carbonero Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
description	Background: Bovine leukemia virus (BLV) is the causative agent of enzootic bovine leukosis (EBL). This disease mainly affects cattle, causing severe economic losses to producers. Objective: To establish individual and herd seroprevalence and determine the risk factors associated with BLV seropositivity for dairy and dual-purpose cattle herds in Ecuador. Methods: A total of 2,668 serum samples from 386 herds were collected. A questionnaire, including variables related to cattle health, management and the environment was completed by each herd. A commercial blocking enzyme-linked immunosorbent assay (ELISA) test was used to determine seropositivity. A generalized estimating equation model (GEE) was developed to determine the factors associated with BLV seropositivity. Results: Individual seroprevalence of BLV infection in Ecuador was 17.3% (CI95% = 15.86-18.74%). Herd prevalence was 37.8% (CI95% = 33.0-42.6%), and intra-herd prevalence ranged between 12.5 and 100% (median: 37.5%). The risk factors associated with BLV seropositivity were artificial insemination (OR: 2,215; CI95% = 1.402-3.501), concrete floors (OR: 2.178; CI95% = 1.217-3.889), presence of wild ruminants (OR: 2.998; CI95% = 1.788-5.027), and sampling season (wet; OR: 1.996; CI95% = 1.140-3.497). Conclusions: Results indicate that BLV is widespread in cattle herds in Ecuador. In addition, the study suggests that a control program to fight BLV infection should focus on controlling the risk factors identified.
format	article
author	Luis R. Saa Lucía T. Guzmán Natacha C. Fierro Luz M. Castro Fabián Reyes-Bueno Alfonso Carbonero
author_facet	Luis R. Saa Lucía T. Guzmán Natacha C. Fierro Luz M. Castro Fabián Reyes-Bueno Alfonso Carbonero
author_sort	Luis R. Saa
title	Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
title_short	Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
title_full	Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
title_fullStr	Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
title_full_unstemmed	Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador
title_sort	seroprevalence and risk factors associated with bovine leukemia virus (blv) seropositivity in cattle herds from ecuador
publisher	Universidad de Antioquia
publishDate	2020
url	https://doaj.org/article/a5617eff609942f2a5ace549200d3102
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Seroprevalence and risk factors associated with bovine leukemia virus (BLV) seropositivity in cattle herds from Ecuador

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