Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (7): 1728-1736.doi: 10.11843/j.issn.0366-6964.2020.07.025

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Establishment and Application of a Real-time PCR Assay for Detecting Bovine Norovirus

SHI Zhihai1,3, WANG Wenjia2, LAN Yali1*, ZHANG Bin1, MENG Hongli1, WANG Yazhou1, HUA Liushuai1, XU Zhaoxue1,3*   

  1. 1. Institute of Animal Husbandry and Veterinary Medicine, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China;
    2. College of Veterinary Medicine and Pharmaceutical Engineering, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China;
    3. Henan Key Laboratory of Farm Animal Breeding and Nutritional Regulation, Zhengzhou 450002, China
  • Received:2020-01-02 Online:2020-07-25 Published:2020-07-22

Abstract: Bovine norovirus (BNoV) is an emerging causative agent of calf diarrhea in China, the aim of the study was to establish a real-time PCR assay for detecting BNoV. One pair of primers was designed based on RNA-dependent RNA polymerase (RdRp) gene of BNoV. The EvaGreen real-time PCR assay was successfully developed after the optimization of amplification conditions. The test results showed that the Ct value showed a good linear relationship with the standard in the range of 2.24×102-2.24×108copies·μL-1 and the correlation coefficient R2=0.997, and the amplification efficiency was 98.44%. There is no specific amplification of other common calf diarrhea pathogens, only BNoV were positive. The detection limit of the method was 22.4 copies·μL-1 for BNoV. The inter-assay and the intra-assay coefficient of variation were both less than 2%, indicating a good repeatability. 221 clinical samples that collected from the diarrheic calves in Henan Province during September 2017 to May 2019 were detected using this real-time PCR assay, and the BNoV detection rate was 11.31% (25/221), the farms positive rate was 92.86% (13/14). These results indicated that the real-time PCR assay has good sensitivity, specificity and repeatability, which can be provide an effective means for detection and epidemiological investigation of BNoV.

Key words: bovine norovirus, real-time PCR, calf diarrhea, detection

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