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3 July 2017 Phylogenetic Analyses of Fowl Adenoviruses (FAdV) Isolated in China and Pathogenicity of a FAdV-8 Isolate
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Abstract

Fowl adenoviruses (FAdVs) have a worldwide distribution and are associated with a variety of diseases, causing considerable economic losses to the poultry industry. We characterized 10 FAdVs isolated from China in 2015–2016 and assessed the pathogenicity of a FAdV-8 strain in specific-pathogen-free (SPF) chickens. Phylogenetic analysis of a hexon gene revealed that only 1 of the 10 isolates belonged to FAdV-8, whereas others belonged to FAdV-4, indicating that Chinese FAdVs were mainly FAdV-4 in recent years. The pathogenicity experiment of the FAdV-8 strain CH/SD/2015/09 showed that no clinical signs were observed in infected chickens. Necropsy displayed mild necrotic foci and petechial hemorrhage of livers collected at 5 days postinfection (dpi). Histopathologic examination identified the presence of intranuclear inclusion bodies in hepatocytes. No virus was detected in oral and cloacal swabs at 5 dpi, and only viral DNA could be measured in kidneys collected at the same time. The results revealed that CH/SD/2015/09 had no obvious pathogenicity in 5-wk-old SPF chickens, which could provide a better understanding about the pathogenicity of the FAdV-8 serotype.

Si-fan Ruan, Jing Zhao, Ying-chao Ren, Jin-ling Feng, and Guo-zhong Zhang "Phylogenetic Analyses of Fowl Adenoviruses (FAdV) Isolated in China and Pathogenicity of a FAdV-8 Isolate," Avian Diseases 61(3), 353-357, (3 July 2017). https://doi.org/10.1637/11671-050817-RegR
Received: 8 May 2017; Accepted: 1 June 2017; Published: 3 July 2017
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