ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (5): 1048-1055.doi: 10.11843/j.issn.0366-6964.2019.05.015

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Detection and Evolutionary Analysis of Bovine Noroviruses in Diarrheic Fecals of Dairy Calves in Some Areas

WANG Yuelin1, GUO Zijing1, YUE Hua1,2, TANG Cheng1,2*   

  1. 1. College of Life Science and Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservati on and Utilization, Chengdu 610041, China
  • Received:2018-07-17 Online:2019-05-23 Published:2019-05-23

Abstract:

Bovine norovirus (BNoV) is a pathogen causing calf diarrhea and has been detected in 19 countries. The aims of this study were to investigate the prevalence and molecular characteristics of the virus in several regions of China. In this study, a total of 93 diarrheic fecal samples and 54 healthy fecal samples collected from 12 farms in 5 provinces were detected by RT-PCR. The results showed that the detection rate of BNoV in diarrhea samples (25.81%) was significantly higher than that of the healthy samples (9.26%) (P<0.01), which proved that the virus was associated with calf diarrhea. Phylogenetic analysis based on 29 RdRp sequences (partial polymerase sequences) showed that 5 strains clustered into GⅢ.1 and the remaining 24 strains clustered into GⅢ.2. Phylogenetic analysis based on 18 partial VP1 and 13 VP2 sequences showed that BNoV strains in China present a unique evolutionary. These results indicated that, as an emerging pathogen with unique evolutionary characteristics in China, BNoV has been widely circulated among dairy calves, providing an important reference for the prevention and control of calf diarrhea in China.

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