Acta Veterinaria et Zootechnica Sinica ›› 2024, Vol. 55 ›› Issue (2): 649-659.doi: 10.11843/j.issn.0366-6964.2024.02.022

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Detection of Bovine Viral Diarrhea Pathogens and Evolution Analysis of Bovine Coronavirus in Langfang, Hebei

LI Siyuan1,2, FU Xincheng5, YUAN Xuesong2,3, MAO Li2,3, CAI Xuhang1,2, SUN Xinru2, HUANG Jin2,3, XIE Lingling6, WANG Fu6, ZHOU Hua7, ZHANG Qi1*, LI Jizong2,3,4*, LI Bin2,3,4*   

  1. 1. College of Veterinary Medicine, Northwest A&F University, Yangling 712100, China;
    2. Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China;
    3. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China;
    4. School of Food and Biological Engineering, School of Life Sciences, Jiangsu University, Zhenjiang 212013, China;
    5. Langfang Municipal Bureau of Agriculture and Rural Affairs, Langfang 065000, China;
    6. Guizhou Testing Center for Livestock and Poultry Germplasm, Guiyang 550018, China;
    7. Qianxi Animal Disease Control Center, Qianxi 551500, China
  • Received:2023-04-18 Online:2024-02-23 Published:2024-02-27

Abstract: Cattle viral diarrhea pathogens have adverse effects on animal husbandry. BVDV, BoAstV, BCoV, MRV, BKoV, BoNeV, BNoV, BRV, BToV were well known as the cause of diarrhea. On the other hand, BVDV, BCoV and BToV also caused respiratory system symptoms. Among them, BVDV not only causes alimentary tract symptoms and respiratory symptoms, but also leads to abnormal reproductive function of cows causing great economic losses. In order to understand the prevalence of the main viral diarrhea pathogens in cattle, 323 fecal samples from diarrheal cow in Hebei province of China were detected by PCR to detect nine common viral diarrhea pathogens. Prevalence of 1.85% (6/323), 14.24% (46/323), 57.89% (187/323), 0.31 (1/323), 10.84% (35/323), 4.33% (14/323), 2.48% (8/323), 4.64% (15/323), 11.76% (38/323), was determined for BVDV, BCoV, BRV, BoAstV, BoNeV, BNoV, MRV, BToV, BKoV, respectively. There were 76 co-infection samples accounting for 23.53% (76/323). Homology and genetic evolution analysis of the complete genomic sequence, S, HE, N, M and E genes of HBLF2302 strain showed that HBLF2302 gene had high homology with BCoV/NMG1/2022 and was GIIb subtype. Based on the amino acid sequence alignment and the tertiary structure prediction of HBLF2302 S protein, it was found that the 157 site was mutated to 157T and the 854 site was mutated to 854I in the S protein. 318V is a unique mutation, which changes the force with the side chain residue and forms a hydrogen bond connection with 631C. It was found that the Chinese strain was different from the GⅡb subtype in other regions, and there were three unique sites in the ORF1a region. This study enriched the epidemiological data about bovine diarrhea pathogens for laying the foundation of bovine pathogens prevention and control.

Key words: viral diarrhea, bovine coronavirus, epidemiology investigation, diarrhea pathogens

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