Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (8): 2016-2021.doi: 10.11843/j.issn.0366-6964.2020.08.027

• RESEARCH NOTES • Previous Articles     Next Articles

Isolation and Identification of Canine Adenovirus CAV-BJ02 Strain

YOU Xinyue1,2, LIU Chang1,2, HAO Yunfeng1,2, LIANG Lin1,2, QIN Tong1,2*, CUI Shangjin1,2*   

  1. 1. Institute of Animal Science and Veterinary Medicine, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Beijing Science Observatory Experimental Station for Veterinary Drugs and Diagnostic Technology of the Ministry of Agriculture and Rural Areas, Beijing 100193, China
  • Received:2019-11-20 Online:2020-08-25 Published:2020-08-19

Abstract: This study aimed to isolate an epidemic strain of the canine adenovirus (CAV) from Beijing. Nasopharyngeal swabs were collected from 2 to 4 months dogs with cough and other respiratory symptoms in a pet hospital in Beijing. The sample showing positive with canine adenovirus after initial screening by colloidal gold and PCR, was propagated in MDCK cells after processing. Continuous subculture was carried out, and typical cytopathic lesions such as rounding, shedding, and grape stringing appeared. The sample was identified by morphological observation, PCR identification and animal regression test. The PCR amplification results indicated that the isolate was a canine adenovirus type II, and it was named as CAV-BJ02 (GenBank:MN744708) strain. Virus titers were determined according to the method of Reed and Muench, and TCID50 of CAV-BJ02 isolated was 106.7·(100 μL)-1 in MDCK cells. Canine adenovirus particles with a regular hexagonal icosahedron and a diameter of about 86 nm can be observed clearly under electron microscope. Phylogenetic analysis showed that the sequence of the CAV-BJ02 strain was consistent with that of CAV type Ⅱ. Animal regression test results showed that CAV-BJ02 strain can cause mild clinical symptoms such as fever, with oral and nasal secretions as the main routes for viral shedding, and the viral shedding period is about 5-6 days, which does not cause dogs to die. The results above provided insights into the prevalence of CAV in Beijing and laid a theoretical foundation for the diagnosis, prevention and treatment of canine adenovirus disease.

Key words: canine adenovirus, isolation and identification, evolutionary analysis, animal experiment

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