Korean J. Vet. Serv. 2021; 44(4): 291-297
Published online December 30, 2021
https://doi.org/10.7853/kjvs.2021.44.4.291
© The Korean Socitety of Veterinary Service
Correspondence to : Tai-Young Hur
E-mail: tyohur@korea.kr
https://orcid.org/0000-0003-3129-2942
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0). which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Severe outbreaks of porcine epidemic diarrhoea virus (PEDV) have continued to re-emerge worldwide. Because of the high mortality rate of suckling piglets in PEDV outbreaks, the disease causes significant economic losses in the pig industry. The limited pre-existing immunity against this virus is thought to cause an explosive increase in infection in pig farms. This study aimed to evaluate the clinical symptoms of PEDV after intentional exposure (feedback). During the first few days of the outbreak in a breeding pig farm, 14 sows showed watery diarrhoea, and the disease subsequently spread rapidly throughout the barn. Pigs that were intentionally exposed to PEDV (n=251) showed watery diarrhoea (46.6%), reduced appetite (17.5%), and vomiting (6.0%). However, 75 exposed pigs (29.9%) showed no clinical signs of disease. Four weeks after the feedback challenge, 34 sows gave birth to litters of piglets, which survived with no diarrhoea. Five weeks after the start of the outbreak, PEDV was not detected in any of the examined samples, including environmental swabs. Thus, early diagnosis, prompt establishment of herd immunity, and strict application of biosecurity are good practices to reduce the mortality rates among new-born piglets and control economic losses in pig farms showing PEDV outbreaks.
Keywords Porcine epidemic diarrhoea, Feedback challenge, Intentional exposure, Herd immunity
Korean J. Vet. Serv. 2021; 44(4): 291-297
Published online December 30, 2021 https://doi.org/10.7853/kjvs.2021.44.4.291
Copyright © The Korean Socitety of Veterinary Service.
Eunju Kim , Seung-Won Yi
, Sang-Ik Oh
, Kyoung-Min So
, Younghun Jung
, Han Gyu Lee
, Joon Ki Hong
, Eun Seok Cho
, Young-Sin Kim
, Tai-Young Hur
*
National Institute of Animal Science, Rural Development Administration, Wanju 55365, Korea
Correspondence to:Tai-Young Hur
E-mail: tyohur@korea.kr
https://orcid.org/0000-0003-3129-2942
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0). which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Severe outbreaks of porcine epidemic diarrhoea virus (PEDV) have continued to re-emerge worldwide. Because of the high mortality rate of suckling piglets in PEDV outbreaks, the disease causes significant economic losses in the pig industry. The limited pre-existing immunity against this virus is thought to cause an explosive increase in infection in pig farms. This study aimed to evaluate the clinical symptoms of PEDV after intentional exposure (feedback). During the first few days of the outbreak in a breeding pig farm, 14 sows showed watery diarrhoea, and the disease subsequently spread rapidly throughout the barn. Pigs that were intentionally exposed to PEDV (n=251) showed watery diarrhoea (46.6%), reduced appetite (17.5%), and vomiting (6.0%). However, 75 exposed pigs (29.9%) showed no clinical signs of disease. Four weeks after the feedback challenge, 34 sows gave birth to litters of piglets, which survived with no diarrhoea. Five weeks after the start of the outbreak, PEDV was not detected in any of the examined samples, including environmental swabs. Thus, early diagnosis, prompt establishment of herd immunity, and strict application of biosecurity are good practices to reduce the mortality rates among new-born piglets and control economic losses in pig farms showing PEDV outbreaks.
Keywords: Porcine epidemic diarrhoea, Feedback challenge, Intentional exposure, Herd immunity