Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (8): 3612-3622.doi: 10.11843/j.issn.0366-6964.2024.08.032

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation and Molecular Characterization of Aichivirus C from Goats

Yuting CHENG(), ABI-Kehamo, Chen YANG, Dingzhong ZHANG, Yunxin REN, Hua YUE, Cheng TANG*()   

  1. College of Animal Husbandry and Veterinary Medicine, Southwest University for Nationalities, Chengdu, Sichuan 610041, China
  • Received:2023-10-23 Online:2024-08-23 Published:2024-08-28
  • Contact: Cheng TANG E-mail:1649846040@qq.com;tangcheng101@163.com

Abstract:

Aichivirus C is a newly confirmed virus associated with caprine diarrhoea. The purpose of this study was to isolate goat Aichivirus C and analyze the genomic characteristics. Nine fecal samples and 13 tissue samples from a dead kid were collected from a goat farm with an outbreak of diarrhoea in Sichuan province, and used for testing the common pathogens associated with diarrhoea. Virus was isolated from Aichivirus C positive samples using Vero cells and identified by PCR, indirect immunofluorescence and electron microscopy. The complete genomes of the isolates were amplified and analyzed. Results were as follows: 8 fecal samples with diarrhoea and 8 tissue samples from a lamb were detected as positive for Aichivirus C by RT-PCR, and no other common diarrhoea-causing pathogens were detected in the above samples. Two Aichivirus C strains were successfully isolated from positive samples using Vero cells, and the virus titers were 106.5TCID50·mL-1 and 105.9TCID50·mL-1, respectively. The nearly full-length genomic sequences of both strains were obtained, which shared 78.8%-97.4% nucleotide identity with the known goat Aichivirus C genomes from GenBank and 97.0%-97.4% nucleotide identity with the SWUN/F11/2019 isolate from China. Furthermore, the VP0, VP3 and VP1 genes were successfully amplified from 5 clinical positive samples. Phylogenetic analysis based on the genome revealed that the two isolates were clustered with the SWUN/F11/2019 strain. Unique amino acid mutations were also revealed in the VP0 and VP1 genes. In summary, two strains of goat Aichivirus C were successfully isolated and the nearly full-length genomic sequences were obtained. Phylogentic analysis demonstrated that these two strains are closely related to the SWUN/F11/2019 strain from China, with a unique molecular characteristics in the VP0 and VP1 genes. The results enrich the molecular genetic information of Aichivirus C from goats in China and laid the foundation for further studies on the pathogenicity and molecular biological characteristics of goat Aichivirus C.

Key words: goat, diarrhea, Aichivirus C, isolation, molecular characterisation

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