Genotypic and geographical distribution of porcine reproductive and respiratory syndrome viruses in mainland China in 1996-2016

文献类型： 外文期刊

第一作者： Gao, Jia-Cong

作者： Gao, Jia-Cong;Xiong, Jun-Yao;Chang, Xiao-Bo;Guo, Jin-Chao;Jiang, Cheng-Gang;Tian, Zhi-Jun;Cai, Xue-Hui;An, Tong-Qing;Ye, Chao;Tong, Guang-Zhi;Zhang, Gui-Hong;Zhang, Gui-Hong

作者机构：

关键词： PRRSV;Epidemiology;Mainland China;Phylogeography

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）

ISSN： 0378-1135

年卷期： 2017 年 208 卷

页码：

收录情况： SCI

摘要： Porcine reproductive and respiratory syndrome (PARS) has caused huge economic losses to Chinese swine industry and remains a major threat since it was first reported in 1996. However, investigations of molecular epidemiological and genetic diversity of PARS viruses (PRRSVs) in China were limited to a small number of representative strains collected in several areas. Moreover, lineage classifications reported by individual researchers were quite different. In the present study, we sequenced ORF5 sequences of 217 PRRSVs from clinical samples, retrieved all the available ORF5 sequences of PRRSVs isolated in China in 1996-2016 (n = 2213) from GenBank, and systematically analyzed corresponding epidemiological data. NA-type PRRSVs in China were classified into five lineages: lineage 1, lineage 3, lineage 5, lineage 8, and lineage 9. Most strains in China belonged to lineage 8 (85.6%), with dominant strains being classified as sublineage 8.3 (78.3%). Importantly, the emerging lineage 1 and lineage 3 strains spread rapidly, and their proportions among circulating PRRSVs have significantly increased in recent years. The geographical distribution of different PRRSV lineages in each province was analyzed and possible inter-province transmission routes were outlined for main lineages and sublineages. To our knowledge, this study is the most comprehensive and extensive phylogeographical analysis of PRRSVs in China since PRRS outbreak in 1996. Our dataset can serve as a canonical standard for PRRSV classification and will help to study genetic evolution of PRRSV. The results of the present study may also improve prevention of PRRS in China.

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