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Concurrent Porcine Reproductive and Respiratory Syndrome Virus, Porcine Circovirus Type 2 and Pseudorabies Virus Infections Associated With 'High Fever Syndrome' in Swine of Northern China | Abstract
ISSN: 2157-7579

Journal of Veterinary Science & Technology
Open Access

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Concurrent Porcine Reproductive and Respiratory Syndrome Virus, Porcine Circovirus Type 2 and Pseudorabies Virus Infections Associated With 'High Fever Syndrome' in Swine of Northern China

Xiaoling Wang1, Feng Hu1, Wencheng Lin1, Zhao Wang1, Kyoung-Jin Yoon2 and Shangjin Cui1*

1Swine Infectious Disease Division, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, Heilongjiang Province, 150001, China

2Department of Veterinary Diagnostic Laboratory and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa 50011, USA

*Corresponding Author:
Dr. Shangjin Cui, DVM, PhD
No. 427, Maduanjie
Nangang District, Harbin
Heilongjiang 150001
People’s Republic of China
E-mail: [email protected]

Received date: August 10, 2011; Accepted date: September 15, 2011; Published date: September 27, 2011

Citation: Wang X, Hu F, Lin W, Wang Z, Yoon K, et al. (2011) Concurrent Porcine Reproductive and Respiratory Syndrome Virus, Porcine Circovirus Type 2 and Pseudorabies Virus Infections Associated With 'High Fever Syndrome' in Swine of Northern China. J Veterinar Sci Technol 2:106 doi:10.4172/2157-7579.1000106

Copyright: © 2011 Wang X, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited

Abstract

Field and laboratory diagnostic investigation was conducted during recent outbreaks of "High Fever Syndrome (HFS)" in numerous large-sized swine farms in Xinjiang of China which obtained pigs from Jiangxi and Hunan Provinces where outbreaks of HFS coincided. The syndrome occurred in these provinces from April 2006 to June 2006 with a peak of index cases in late May 2006. The most common clinical symptoms of HFS in affected pigs were elevating body temperature and rubefaction. Overall morbidity and mortality ranged from 20 to 80%. In sow farms the abortion rate by HFS reached 65% and many weaned piglets had severe dyspnea. The incidence rate of the syndrome in finishing/marketing pigs (10-15 months of age) was up to 50%. In deceased pigs, organ failure was observed in the lungs, liver, spleen, intestines, and lymph nodes. Animals examined had serological evidence of prior exposure to pseudorabies virus (PRV). Furthermore, laboratory testing by a PCR assay on samples from clinically affected animals demonstrated that the majority of index animals were concurrently infected with PRRSV and porcine circovirus type 2, suggesting that epidemic outbreaks of HFS was attributed to infection by multiple viral agents. Many index cases appeared to be related to the application of multiple live virus vaccines in an uncontrolled manner, raising the necessity for implementation of rigid regulation for vaccination programs.

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