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Genetic analysis of porcine circovirus type 2 in China

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Abstract

Porcine circovirus type 2 (PCV2) is the cause of postweaning multisystemic wasting syndrome (PMWS), which encompasses several distinct symptoms in pigs. PCV2 infection and clinical incidence of PMWS have increased in recent years, possibly due to shifts in viral populations and mutations. In this study, we identified PVC2 strains currently afflicting pig populations in mainland China, because this is a prerequisite for developing a specific vaccine to control the spread of PMWS. We collected 235 tissue samples from 16 provinces between 2014 and 2016. Of these, 152 samples were positive for PCV2. We compared the sequences we obtained for the PVC2 capsid gene, ORF2, to those of the Chinese PCV2 sequences deposited in GenBank between 2002 and 2016 (n = 648). Phylogenetic analyses demonstrated that the PCV2d genotype was the most prevalent strain in the sample population included in GenBank and among the positive samples from this study. We also found one PCV2c strain among the GenBank sequences. Furthermore, PCV2a-2F was the predominant genotype in the PCV2a cluster. Amino acid sequence comparisons demonstrated 70.8–100% identity within PCV ORF2 and several consistent mutations in ORF2. More interestingly, six isolates were classified as recombinant strains. Cumulatively, this study represents the first comprehensive description of PCV2 strains distribution, including recent samples, in Chinese porcine populations. We demonstrate the existence of high genetic variability among PVC2 strains and the ability of this virus to rapidly evolve.

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Acknowledgements

This work was supported by a grant from the National Natural Science Foundation of China (No. 31270045).

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Authors and Affiliations

  1. State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, No. 678 Haping Street, Xiangfang District, Harbin, 150069, China

    Cheng-Gang Jiang, Gang Wang, Ya-Bin Tu, Yong-Gang Liu, Shu-Jie Wang, Xue-Hui Cai & Tong-Qing An

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  1. Cheng-Gang Jiang
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Correspondence to Xue-Hui Cai or Tong-Qing An.

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Jiang, CG., Wang, G., Tu, YB. et al. Genetic analysis of porcine circovirus type 2 in China. Arch Virol 162, 2715–2726 (2017). https://doi.org/10.1007/s00705-017-3414-1

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