Epidemiological and genetic characteristics of porcine reproduction and respiratory syndrome virus 2 in mainland China, 2017-2018
文献类型： 外文期刊
作者： Xie, Sisi 1 ; Liang, Wan 1 ; Wang, Xueying 1 ; Chen, Hongjian 1 ; Fan, Jie 1 ; Song, Wenbo 1 ; Hua, Lin 1 ; Tang, Xibiao; 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Vet Med, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Cooperat Innovat Ctr Sustainable Pig Prod, Wuhan 430070, Peoples R China
3.Hubei Acad Agr Sci, Anim Husb & Vet Inst, Key Lab Prevent & Control Agents Anim Bacteriosis, Minist Agr, Wuhan 430070, Peoples R China
期刊名称：ARCHIVES OF VIROLOGY （ 影响因子：2.574； 五年影响因子：2.466 ）
ISSN： 0304-8608
年卷期： 2020 年 165 卷 7 期
页码：
收录情况： SCI
摘要： Porcine reproductive and respiratory syndrome virus 2 (PRRSV2) is a major threat to the global pig industry, particularly in China, the world's largest pig-rearing and pork-production country. Continuously monitoring the epidemiological and genetic characteristics of PRRSV epidemic strains is beneficial for prevention and control of infection. Previously, we reported the epidemiological and genetic characteristics of PRRSV2 in China from 2012 to 2016. Here, the epidemiological and genetic characteristics of PRRSV2 in China from 2017 to 2018 are reported. During these two years, we collected different types of porcine samples from 2428 pig farms in 27 provinces in China. Of the 7980 samples collected, 2080 (26.07%) were positive for PRRSV2 ORF5 by RT-PCR. The positive rate of PRRSV detection between different regions of China ranged from 8.12% to 29.33%, and from 7.96% to 55.50% between different months. Phylogenetic analysis based on the ORF5 gene revealed that the PRRSV2 strains currently circulating in China belong to five clades, and most of the PRRSVs detected are highly pathogenic PRRSVs (HP-PRRSVs; clade IV) and PRRSV NADC30-like strains (clade I). Sequence analysis revealed multiple amino acid mutation types, including amino acid changes and deletions in both the GP5 and Nsp2 proteins. The presence of these mutations may have an effect on the evolution of the virus by altering the viral titer and/or affecting the antibody response against the virus.
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