1株猪源H9N2亚型流感病毒的分子特征

doi:10.11843/j.issn.0366-6964.2020.09.029

Abstract

Abstract: The objective of this study was to explore the epidemic situation and pathogenic characteristics of swine influenza virus (SIV) in Shandong Province. In the spring of 2019, 130 swine nasal swab samples were collected from a slaughterhouse in Tai'an city, Shandong Province for virus isolation and identification. The whole genome of isolated virus was sequenced and analyzed. Meanwhile, 1 527 swine serum samples were collected from swine farms in 8 regions of Shandong province and their anti-SIV antibody were detected by HI assay using standard avian H9N2 antigen. The results showed that a H9N2 subtype influenza virus strain was isolated and named as A/swine/Shandong/TA009/2019(H9N2). The homology analysis showed that the isolated virus had close genetic relationship with A/environment-air/Kunshan/NIOSH-BL20/2018(H9N2) and A/environment-air/Kunshan/NIOSH-BL25/2018(H9N2), and the nucleotide homology of the gene fragments were above 99.5%. Phylogenetic analysis results demonstrated that HA and NA genes of the isolated virus belong to the Y280-like lineage, PB2 and M genes belong to the G1-like lineage, and PB1, PA, NP and NS genes belong to the SH/F98-like lineage. The cleavage site in HA protein is “PSRSSR/GL”, which was in accordance with the molecular biological characteristics of low pathogenic avian influenza virus.The position 216 of HA protein is L, and it has the ability to bind human-derived sialic acid α 2,6-Gal. The results of HI showed that 9 among 1 527 serum samples were positive with a positive rate of 0.59%. The isolated virus was swine-derived H9N2 virus, and serological investigations revealed that H9N2 subtype virus infection was present in swine herds in Shandong Province. The results of this study suggest that continuous surveillance of the SIV epidemiological situation and its pathogenic characteristics should be strengthened.

Key words: swine influenza virus, H9N2, molecular characterization, serology

CLC Number:

S852.659.5

ZHAO Yuzhong, DING Guofei, LIU Jiaqi, LI Li, LI Yingchao, WANG Bin, SHAO Qingyuan, FENG Jian, GUO Lihong, LIU Sidang, XIAO Yihong. Molecular Characterization of a H9N2 Subtype Swine Influenza Virus[J]. Acta Veterinaria et Zootechnica Sinica, 2020, 51(9): 2312-2318.

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Molecular Characterization of a H9N2 Subtype Swine Influenza Virus

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