ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (2): 343-353.doi: 10.11843/j.issn.0366-6964.2019.02.012

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Amplification, Sequence Analysis of Bovine Coronavirus Genes and Isolation of the Viruses from Yak

HE Qifu1, TANG Cheng1,2, GUO Zijing1, TAN Shuo1, ZHANG Bin1,2, YUE Hua1,2*   

  1. 1. College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu 610041, China
  • Received:2018-06-28 Online:2019-02-23 Published:2019-02-23

Abstract:

The aim of this study was to investigate molecular prevalence of bovine coronavirus (BCoV) in yak in Qinghai-Tibetan Plateau and to isolate BCoV from clinical samples. RT-PCR assay was used to detect BCoV from 336 diarrhea feces samples of yak from Tibet, Qinghai, Sichuan and Yunnan, and the S, HE, and N gene fragments were further amplified, moreover, positive samples were used to isolate BCoV strain. Results were as follows:Approximate 69.05% (232/336) diarrheic samples were detected BCoV positive by RT-PCR. Sequence and phylogenetic analysis showed that BCoV S1 subunit sequence, HE gene fragment and N gene fragment from 32 clinical samples in this study had unique evolutionary features. Notably, a BCoV strain of yak was successfully isolated firstly, the TCID50 of this strain was 10-7.17·0.1 mL-1,and a recombinant event was predicted in S gene of this strain. These results indicate that BCoV widely circulates in yak in the Qinghai-Tibetan Plateau of China and exhibit unique evolution.

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