China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (10): 3932-3942.doi: 10.16431/j.cnki.1671-7236.2022.10.026

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation and Identification of Yunnan Fowl Adenovirus-4 and Sequence Analysis of Hexon Gene

XUE Xiaoyan1, ZHANG Zhenxing2, ZENG Yi3, JI Jia1, DAI Hongyang4, LI Suhua1, SONG Jianling2   

  1. 1. College of Life Sciences, Southwest Forestry University, Kunming 650224, China;
    2. Yunnan Key Laboratory of Tropical and Subtropical Animal Virus Diseases, Yunnan Academy of Animal Husbandry and Veterinary, Kunming 650224, China;
    3. Shuifu Liangwan Town Agriculture, Countryside and Collective Economic Development Center, Shuifu 657803, China;
    4. The Management Bureau of Huize Black Necked Crane National Nature Reserve, Qujing 654200, China
  • Received:2022-04-07 Online:2022-10-05 Published:2022-09-30

Abstract: 【Objective】 This study was aimed to analyze the prevalence,genetic difference of Hexon gene and pathogenicity of Fowl adenovirus-4 (FAdV-4) in Yunnan province,so as to provide reference for the epidemiology of FAdV-4 and the influence of Hexon gene on virus virulence.【Method】 158 samples of poultry liver tissue suspected of FAdV-4 infection and 310 fresh feces of wild birds were collected from January 2020 to June 2021 in Kunming,Qujing,Chuxiong,Dali,Honghe and Yuxi of Yunnan province,FAdV-4 nucleic acid was detected by PCR,representative positive samples were isolated and identified,and pathogenic and Hexon gene sequence of isolated strains were analyzed.【Result】 In 158 poultry tissue samples,19 samples were positive for FAdV-4 pathogenic nucleic acid,with a positive rate of 12.03%,and 1 sample (Black-necked cranes) was positive for 310 fresh feces of wild birds,with a positive rate of 0.3%.7 strains of FAdV-4 were isolated from positive samples.The results of pathogenicity study showed that all strains of FAdV-4 in Yunnan could cause chicken embryo dysplasia and pericardial effusion-hepatitis syndrome in 4-week broilers.The embryo median lethal dose (ELD50) was 10―6.17 to 10―4.32/mL.The 7 strains were clustered in the branches of FAdV-C subgroup,and Hexon protein had the same characteristics of 188R,193R and 195Q as domestic highly pathogenic strains.The strains infected with SPF chickens showed obvious clinical symptoms,highly pathogenic,high lethality and significant hepatocellular lesions.【Conclusion】 The prevalence of FAdV-4 in Yunnan was preliminarily understood,FAdV-4 pathogenic nucleic acid was detected in the feces of Black-necked cranes for the first time,7 strains of FAdV-4 were isolated,and some strains of Hexon protein had amino acid mutations.

Key words: Fowl adenovirus-4 (FAdV-4); Hexon gene; pathogenicity; genetic evolution

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