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Prevalence, genomic characteristics, and pathogenicity of fowl adenovirus 2 in Southern China

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Title: Prevalence, genomic characteristics, and pathogenicity of fowl adenovirus 2 in Southern China
Authors: Junqin Zhang, Zimin Xie, Yanlin Pan, Zuoxin Chen, Yunzhen Huang, Linlin Li, Jiawen Dong, Yong Xiang, Qi Zhai, Xingying Li, Minhua Sun, Shujian Huang, Ming Liao
Source: Poultry Science, Vol 103, Iss 1, Pp 103177- (2024)
Publisher Information: Elsevier, 2024.
Publication Year: 2024
Collection: LCC:Animal culture
Subject Terms: fowl adenovirus 2, prevalence, complete genome, recombination, pathogenicity, Animal culture, SF1-1100
More Details: ABSTRACT: In recent years, the occurrence of fowl adenovirus 2 (FAdV-2) has been on the rise in China, posing a significant threat to the poultry industry. This study aimed to investigate the epidemiology, phylogenetic relationship, genomic characteristics, and pathogenicity of FAdV-2. The epidemiological analysis revealed the detection of multiple FAdV serotypes, including FAdV-1, FAdV-2, FAdV-3, FAdV-4, FAdV-8a, FAdV-8b, and FAdV-11 serotypes. Among them, FAdV-2 exhibited the highest proportion, accounting for 21.05% (8/38). The complete genomes of these 8 FAdV-2 strains were sequenced. Genetic evolution analysis indicated that these FAdV-2 strains formed a separate branch within the FAdV-D group, sharing 94.60 to 97.90% nucleotide similarity with the reference FAdV-2 and FAdV-11 strains. Notably, the recombination analysis revealed that 5 out of the 8 FAdV-2 strains, exhibited recombination events between FAdV-2 and FAdV-11. The recombination regions involved Hexon, Fiber, ORF19 genes and 3′ end. Furthermore, pathogenicity experiments demonstrated that recombinant FAdV-2 XX strain is capable of inducing mortality rate of 66.70% and causing more severe hepatitis hydropericardium syndrome (HHS) in 6-wk-old specific-pathogen-free chickens. These findings contribute to our understanding of the prevalence, genomic characteristics, and the pathogenicity of FAdV-2, providing foundations for FAdV-2 vaccine development.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 0032-5791
Relation: http://www.sciencedirect.com/science/article/pii/S003257912300696X; https://doaj.org/toc/0032-5791
DOI: 10.1016/j.psj.2023.103177
Access URL: https://doaj.org/article/43ac8e115d064ec1803f6bafc5ff27f4
Accession Number: edsdoj.43ac8e115d064ec1803f6bafc5ff27f4
Database: Directory of Open Access Journals
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  Data: ABSTRACT: In recent years, the occurrence of fowl adenovirus 2 (FAdV-2) has been on the rise in China, posing a significant threat to the poultry industry. This study aimed to investigate the epidemiology, phylogenetic relationship, genomic characteristics, and pathogenicity of FAdV-2. The epidemiological analysis revealed the detection of multiple FAdV serotypes, including FAdV-1, FAdV-2, FAdV-3, FAdV-4, FAdV-8a, FAdV-8b, and FAdV-11 serotypes. Among them, FAdV-2 exhibited the highest proportion, accounting for 21.05% (8/38). The complete genomes of these 8 FAdV-2 strains were sequenced. Genetic evolution analysis indicated that these FAdV-2 strains formed a separate branch within the FAdV-D group, sharing 94.60 to 97.90% nucleotide similarity with the reference FAdV-2 and FAdV-11 strains. Notably, the recombination analysis revealed that 5 out of the 8 FAdV-2 strains, exhibited recombination events between FAdV-2 and FAdV-11. The recombination regions involved Hexon, Fiber, ORF19 genes and 3′ end. Furthermore, pathogenicity experiments demonstrated that recombinant FAdV-2 XX strain is capable of inducing mortality rate of 66.70% and causing more severe hepatitis hydropericardium syndrome (HHS) in 6-wk-old specific-pathogen-free chickens. These findings contribute to our understanding of the prevalence, genomic characteristics, and the pathogenicity of FAdV-2, providing foundations for FAdV-2 vaccine development.
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