ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (10): 2232-2239.doi: 10.11843/j.issn.0366-6964.2018.10.019

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Pathogenicity Analysis of Three Bovine Viral Diarrhea Viruses from Different Sources in Mice

RUAN Wen-qiang1, CHEN Xin-nuo1, REN Yu-peng1, QIN Si-nan1, TANG Cheng1,2, ZHANG Bin1,2*   

  1. 1. College of Life Science Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Animal Disease Prevention and Control Innovation Team in the Qinghai Tibet Plateau of State Ethnic Affairs Commission, Chengdu 610041, China
  • Received:2017-12-13 Online:2018-10-23 Published:2018-10-23

Abstract:

This study aims at analyzing the pathogenicity of bovine viral diarrhea virus (BVDV) in mice, BALB/c mice were selected as experimental animals in this study, the challenge group were inoculated with yak-derived BVDV1-DJ2, BVDV1-Z6 and Oregon C24V strains respectively by intraperitoneal injection, and the control group were inoculated with DMEM medium. The blood and tissues of the mice were collected on the 5th, 7th, and 10th day after inoculation, and the pathogenicity of the virus-infected mice were studied by blood routine, histopathology, and fluorescence quantitative PCR. The results showed, after the challenge, the clinical symptoms of the mice in the Z6 group were more severe than those in the DJ2 group. The lymphocyte, leukocyte, and platelet contents of the challenge group decreased significantly. The results of the fluorescence quantitative PCR showed that the BVDV was detected in the lung and liver. The rate of Z6 group was significantly higher than that of DJ2 group. HE staining showed that there were inflammatory cell infiltration, necrosis and shedding of intestinal villus epithelial cells in the liver of the challenge group, and it also showed that there were increased spleen endocytosis and reactive hyperplasia of spleen, alveolar atrophy and hemorrhage and other pathological changes. Compared with the Oregon C24V group, the lesion of Z6 group were the most serious and the lesion of DJ2 group was lighter. Using BALB/c mice as experimental animals and the way of intraperitoneal injection, this study can provide data support and guiding significance for the pathogenicity of BVDV-infected mice and the construction of models.

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