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African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm

African swine fever (ASF) was first detected in Latvia in wild boar at the Eastern border in June 2014. Since then ASF has continued to spread in wild boar populations covering almost whole territory of the country. Sporadic outbreaks occurred at the same time in domestic pig holdings located in wil...

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Autores principales: Lamberga, Kristīne, Oļševskis, Edvīns, Seržants, Mārtiņš, Bērziņš, Aivars, Viltrop, Arvo, Depner, Klaus
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559702/
https://www.ncbi.nlm.nih.gov/pubmed/32784575
http://dx.doi.org/10.3390/vetsci7030105
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author Lamberga, Kristīne
Oļševskis, Edvīns
Seržants, Mārtiņš
Bērziņš, Aivars
Viltrop, Arvo
Depner, Klaus
author_facet Lamberga, Kristīne
Oļševskis, Edvīns
Seržants, Mārtiņš
Bērziņš, Aivars
Viltrop, Arvo
Depner, Klaus
author_sort Lamberga, Kristīne
collection PubMed
description African swine fever (ASF) was first detected in Latvia in wild boar at the Eastern border in June 2014. Since then ASF has continued to spread in wild boar populations covering almost whole territory of the country. Sporadic outbreaks occurred at the same time in domestic pig holdings located in wild boar infected areas. Here we present the results of the epidemiological investigation in two large commercial farms. Several parameters were analyzed to determine the high risk period (HRP) and to investigate the ASF virus spread within the farm. Clinical data, mortality rates and laboratory results proved to be good indicators for estimating the HRP. The measures for early disease detection, particularly the enhanced passive surveillance that is targeting dead and sick pigs, were analyzed and discussed. Enhanced passive surveillance proved to be a key element to detect ASF at an early stage. The study also showed that ASF virus might spread slowly within a large farm depending mainly on direct contacts between pigs and the level of internal biosecurity. Findings suggest improvements in outbreak prevention, control measures and may contribute to a better understanding of ASF spreading patterns within large pig herds. Culling of all pigs in large commercial farms could be reconsidered under certain conditions.
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spelling pubmed-75597022020-10-29 African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm Lamberga, Kristīne Oļševskis, Edvīns Seržants, Mārtiņš Bērziņš, Aivars Viltrop, Arvo Depner, Klaus Vet Sci Case Report African swine fever (ASF) was first detected in Latvia in wild boar at the Eastern border in June 2014. Since then ASF has continued to spread in wild boar populations covering almost whole territory of the country. Sporadic outbreaks occurred at the same time in domestic pig holdings located in wild boar infected areas. Here we present the results of the epidemiological investigation in two large commercial farms. Several parameters were analyzed to determine the high risk period (HRP) and to investigate the ASF virus spread within the farm. Clinical data, mortality rates and laboratory results proved to be good indicators for estimating the HRP. The measures for early disease detection, particularly the enhanced passive surveillance that is targeting dead and sick pigs, were analyzed and discussed. Enhanced passive surveillance proved to be a key element to detect ASF at an early stage. The study also showed that ASF virus might spread slowly within a large farm depending mainly on direct contacts between pigs and the level of internal biosecurity. Findings suggest improvements in outbreak prevention, control measures and may contribute to a better understanding of ASF spreading patterns within large pig herds. Culling of all pigs in large commercial farms could be reconsidered under certain conditions. MDPI 2020-08-07 /pmc/articles/PMC7559702/ /pubmed/32784575 http://dx.doi.org/10.3390/vetsci7030105 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Case Report
Lamberga, Kristīne
Oļševskis, Edvīns
Seržants, Mārtiņš
Bērziņš, Aivars
Viltrop, Arvo
Depner, Klaus
African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title_full African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title_fullStr African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title_full_unstemmed African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title_short African Swine Fever in Two Large Commercial Pig Farms in LATVIA—Estimation of the High Risk Period and Virus Spread within the Farm
title_sort african swine fever in two large commercial pig farms in latvia—estimation of the high risk period and virus spread within the farm
topic Case Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7559702/
https://www.ncbi.nlm.nih.gov/pubmed/32784575
http://dx.doi.org/10.3390/vetsci7030105
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