Age-dependence of hypervirulent fowl adenovirus type 4 pathogenicity in specific-pathogen-free chickens
文献类型： 外文期刊
作者： Yuan, Feng 1 ; Song, Huiqi 2 ; Hou, Lei 3 ; Wei, Li 2 ; Zhu, Shanshan 2 ; Quan, Rong 2 ; Wang, Jing 2 ; Wang, Dan 2 ; Jiang, 1 ;
作者机构： 1.Tianjin Univ Sci & Technol, Sch Biotechnol, Tianjin, Peoples R China
2.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, Beijing Key Lab Prevent & Control Infect Dis Live, Beijing, Peoples R China
3.Yangzhou Univ, Coll Vet Med, Yangzhou, Jiangsu, Peoples R China
4.Yangzhou Univ, Jiangsu Coinnovat Ctr Prevent & Control Important, Yangzhou, Jiangsu, Peoples R China
关键词： hvFAdV-4; HHS; genetic property; pathogenicity; chicken age
期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）
ISSN：
年卷期： 2021 年 100 卷 8 期
页码：
收录情况： SCI
摘要： Hypervirulent fowl adenovirus serotype 4 (hvFAdV-4) has emerged as a major pathogen of hepatitis-hydropericardium syndrome (HHS) with increased mortality in chickens, resulting in economic losses to the Chinese poultry industry since June 2015. Here, we isolated a hypervirulent FAdV-4 (hvFAdV-4) strain (designated GD616) from 25-day-old meat-type chickens with severe HHS in Guangdong Province China in June 2017. The whole genome of the strain GD616 shares high homology with those in the recently-reported hvFAdV-4 isolates in China, with natural deletions of ORF19 and ORF27. A comparative analysis of Hexon and Fiber-2 proteins revealed that 2 unique amino acid residues at positions 378 and 453 of the Fiber-2 protein might be associated with virulence due to their occurrences in all the hvFAdV-4 isolates only. To systemically evaluate the effect of age on the susceptibility of chickens to hvFAdV-4, we used this hvFAdV-4 strain to intramuscularly inoculate 7- to 180-day-old specific-pathogen-free chickens for the evaluation of pathogenicity. These results showed that the pathogenicity of the hvFAdV-4 strain GD616 to chickens exhibited age-relatedness, with younger than 59-day-old chickens showing 100% morbidity and mortality, while 180-day-old chickens still exhibited a hydropericardium syndrome-like clinicopathology with 60% morbidity and 20% mortality. These findings enrich the current available knowledge regarding the pathogenicity of the hypervirulent FAdV-4 virus in chickens with a wide range of ages, which assists with the selection of suitable-aged chickens for the evaluation of hvFAdV-4 vaccines.
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