Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (5): 2050-2061.doi: 10.11843/j.issn.0366-6964.2023.05.026

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Isolation, Identification and Pathogenicity Analysis of a Duck Adenovirus Type 3

CAO Xiuyun1, LIU Jiwen1, TANG Zhihui1, ZHENG Ziyi1, YAN Liping1,2*, SONG Suquan1*   

  1. 1. Animal Health and Food Safety Laboratory, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210000, China;
    2. Nanjing Agricultural University Institute of Immunology, Nanjing 210000, China
  • Received:2022-05-18 Online:2023-05-23 Published:2023-05-20

Abstract: The purpose of this study was to isolate a novel Duck adenovirus 3 (DAdV-3) YN strain and elucidate its genetic characteristics and pathogenicity. LMH cells were selected for virus isolation and purification, and then the virus genes, including hexon, penton base, fiber1, and fiber2 were sequenced and analyzed. Seven-days-old Muscovy ducks were infected by intramuscular injection in the legs, and the mental state of the ducks was observed. Besides, the body weight changes, necropsy characteristics of organs, histopathological changes, viral load of organs, cloaca swab detoxification, and serum biochemistry were recorded and analyzed. Furthermore, the transcription levels of apoptosis-related genes in the bursa and the spleen were measured to explore the effect of YN strain on immune function. The results showed that the weight gain of infected ducks was significantly inhibited (P<0.01, P<0.000 1), and different degrees of lesions appeared in various organs. The coefficients of livers and kidneys of the experimental group were larger than those of the control group, and the difference was extremely significant on the 7th day after the challenge. Alanine aminotransferase, aspartate aminotransferase, and urea nitrogen in the serum of the Muscovy ducks in the challenge group were significantly higher than those in the control group (P<0.001, P<0.0001). At the same time, the mRNA levels of apoptosis-related genes in the bursa and the spleen increased significantly (P<0.01, P<0.001). (Conclusion) The above results suggest that DAdV-3 YN strain can damage livers and kidneys when challenging the 7-days-old Muscovy ducks, simultaneously, it can affect the immune function of Muscovy ducks by causing apoptosis of cells in the bursa and the spleen.

Key words: duck adenovirus 3, genetic characteristics, pathogenicity, immune function

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