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Genetic and pathogenic characteristics of a novel infectious bronchitis virus strain in genogroup VI (CK/CH/FJ/202005)

文献类型： 外文期刊

作者： Wang, Chen-yan 1 ; Luo, Zhong-bao 2 ; Shao, Guo-qing 1 ; Hou, Bo 1 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Anim Husb & Vet Med, Fujian Anim Dis Control Technol Dev Ctr, Fuzhou 350013, Fujian, Peoples R China

2.Fujian Sunner Dev Co Ltd, Nanping 354100, Fujian, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Vet Med, Natl Res Ctr Engn & Technol Vet Bioprod, Key Lab Vet Biol Engn & Technol,Minist Agr, Nanjing 210014, Jiangsu, Peoples R China

关键词： Infectious bronchitis virus; Pathogenicity; GVI; TC07-2 strain

期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.246； 五年影响因子：3.565 ）

ISSN： 0378-1135

年卷期： 2022 年 266 卷

页码：

收录情况： SCI

摘要： Infectious bronchitis virus (IBV) has a significant impact on the poultry industry, and genogroup VI (GVI) IBVs, such as the TC07-2 strain, were reported in China since 2007. We isolated a novel strain, CK/CH/FJ/202005 (henceforth 202005), from broilers that were vaccinated with different attenuated IBV strains (H120, 4/91, or QX) in Fujian, China during 2020. Based on comparison with the SNU8065 strain (GI-22), the 1ab genes were the locations of recombination in this new isolate. Pathogenicity testing of 1-day-old and 15-day-old specific pathogen-free (SPF) chickens indicated varying severities of air sacculitis beginning 5 days-post-inoculation (DPI). Histopathological analysis indicated that tracheal lesions started at 5 DPI and persisted throughout the 30-day experiments in 1-day-old infected chickens. Virus re-isolation and viral load tests indicated this strain was mainly in the trachea, and not the kidneys. Our findings showed that the 202005 strain was pathogenic in 1-day-old and 15-day-old chickens. These results should be considered when developing strategies to control IBV infections.

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