Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (7): 1768-1774.doi: 10.11843/j.issn.0366-6964.2020.07.030

• RESEARCH NOTES • Previous Articles    

Genomic and Evolutionary Characterization of a H1N1 Swine Influenza Virus and Its Pathogenicity in Mice

ZHAO Yuzhong1,2,3, DING Guofei1,2,3, LIU Jiaqi1,2,3, LI Li1,2,3, LI Yingchao1,2,3, WANG Bin1,2,3, SHAO Qingyuan1,2,3, FENG Jian1,2,3, GUO Lihong1,2,3, LIU Sidang1,2,3, XIAO Yihong1,2,3*   

  1. 1. College of Animal Science and Technology, Shandong Agricultural University Tai'an 271018, China;
    2. Department of Basic Veterinary Medicine, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai'an 271018, China;
    3. Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Tai'an 271018, China
  • Received:2020-01-13 Online:2020-07-25 Published:2020-07-22

Abstract: This study aimed to understand the epidemiological situation of swine influenza virus (SIV) and analyze its evolutionary and genomic characterization in Henan province. In April 2018, 150 nasal swabs were collected from a pig herd with suspected influenza clinical signs to isolate the virus. The isolated virus was sequenced and analyzed. The pathogenicity was evaluated by infecting BALB/c mice. A strain of H1N1 subtype SIV was isolated and named of A/swine/Henan/NY20/2018(H1N1). Phylogenetic analysis results demonstrated that HA and NA genes of the isolated virus belong to the Eurasian avian H1N1 lineage, PB2, PB1, PA, NP and M genes belonged to the pdm/09 H1N1 lineage, and NS gene belonged to the classical swine H1N1 lineage. The HA protein cleavage site of the isolated is PSIQSR↓GL, which accords with the molecular characteristics of low pathogenic avian influenza virus. It can effectively replicate in the lungs and turbinates of mice and can cause pathological changes in lung tissue. A triple reassortant H1N1 subtype virus was isolated in this study, which has a certain pathogenicity to mice, suggesting that further monitoring of SIV should be strengthened.

Key words: swine influenza virus, H1N1 subtype, pathogenicity

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