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Pathogenicity of porcine reproductive and respiratory syndrome virus (ORF5 RFLP 1-7-4 viruses) in China

文献类型： 外文期刊

作者： Xie, Chang-Zhan 1 ; Ha, Zhuo 1 ; Zhang, Han 1 ; Zhang, Ying 1 ; Xie, Yu-Biao 1 ; Zhang, He 1 ; Nan, Fu-Long 1 ; Wang, Zhe 1 ;

作者机构： 1.Acad Mil Med Sci, Inst Mil Vet Med, Changchun, Peoples R China

2.Jilin Agr Univ, Coll Anim Sci & Technol, Changchun, Peoples R China

3.Chinese Acad Agr Sci, Inst Specialty, Changchun, Peoples R China

4.Inner Mongolia Univ Nationalities, Coll Anim Sci & Technol, Tongliao, Peoples R China

5.Yangzhou Univ, Jiangsu CoInnovat Ctr Prevent & Control Important, Yangzhou, Jiangsu, Peoples R China

关键词： epidemiology; ORF5 RFLP 1-7-4-like; pathogenesis; porcine reproductive and respiratory syndrome virus

期刊名称：TRANSBOUNDARY AND EMERGING DISEASES （ 影响因子：5.005； 五年影响因子：4.622 ）

ISSN： 1865-1674

年卷期：

页码：

收录情况： SCI

摘要： Porcine reproductive and respiratory syndrome virus (PRRSV) is an RNA virus that causes reproductive failure in sows and respiratory problems in piglets. PRRSV infection leads to substantial pig mortality and causing huge economic losses so that disease outbreaks caused by the new PRRSV strain from other regions have caused great concern in China. In this study, we analysed the pathogenicity of the novel ORF5 RFLP 1-7-4-like PRRSV strain, named PRRSV-ZDXYL-China-2018-1 in pigs. The viral challenge test showed that PRRSV-ZDXYL-China-2018-1 infection can cause persistent fever, moderate dyspnoea, serum viraemia and interstitial pneumonia in piglets. The levels of viral loads in serum and PRRSV-specific antigen were also detected in lung tissues were used one-step Taq-Man RT-qPCR and Immunohistochemistry, respectively. At 28dpi, the level of specific antibodies was increased among infected piglets. Importantly, the new virus appeared be a moderately virulent isolate with pathogenicity compared to HP-PRRSV strain LQ (JXA1-like strain). Histological examination revealed severe monocyte haemorrhage and interstitial pneumonia associated with monocyte infiltration in the lung tissue of pigs infected with PRRSV-ZDXYL-China-2018-1 and LQ-JXA1 strains. Immunohistochemistry (IHC) results showed positive brown-red epithelial cells and macrophages in pig lungs. Therefore, it is critical to establish an effective strategy to control the spread of PRRSV in China.

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