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Antigenic Characterization of Infectious Bronchitis Virus in the South China during 2021-2022

文献类型： 外文期刊

作者： Yuan, Weifeng;Lv, Ting;Jiang, Weiwei;Hou, Yuechi;Wang, Qingyi;Ren, Jinlian;Fan, Lei;Xiang, Bin;Lin, Qiuyan;Ding, Chan;Ren, Tao;Chen, Libin

作者机构：

关键词： infectious bronchitis virus;chicken coronavirus;antigenic characterization;molecular evolution

期刊名称： VIRUSES-BASEL

ISSN：

年卷期： 2023 年 15 卷 6 期

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收录情况： SCIE（2023版）

摘要： Avian infectious bronchitis is a serious and highly contagious disease that is caused by the infectious bronchitis virus (IBV). From January 2021 to June 2022, 1008 chicken tissue samples were collected from various regions of southern China, and 15 strains of the IBV were isolated. Phylogenetic analysis revealed that the strains mainly comprised the QX type, belonging to the same genotype as the currently prevalent LX4 type, and identified four recombination events in the S1 gene, among which lineages GI-13 and GI-19 were most frequently involved in recombination. Further study of seven selected isolates revealed that they caused respiratory symptoms, including coughing, sneezing, nasal discharge, and tracheal sounds, accompanied by depression. Inoculation of chicken embryos with the seven isolates resulted in symptoms such as curling, weakness, and bleeding. Immunization of specific pathogen-free (SPF) chickens with inactivated isolates produced high antibody levels that neutralized the corresponding strains; however, antibodies produced by vaccine strains were not effective in neutralizing the isolates. No unambiguous association was found between IBV genotypes and serotypes. In summary, a new trend in IBV prevalence has emerged in southern China, and currently available vaccines do not provide protection against the prevalent IBV strains in this region, facilitating the continued spread of IBV.

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