ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (3): 597-605.doi: 10.11843/j.issn.0366-6964.2018.03.017

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Detection of Porcine Diarrhea Associated Virus and Genetic Variation Analysis of S Gene of Porcine Epidemic Diarrhea Virus in Hebei Province

ZHANG Ruo-xi1, ZHANG Zhi2, GU Wen-yuan1, LIU Tian-ju1, LI Chong1, WANG Jian-chang3, LI Bin4, YUAN Wan-zhe5, WANG Yu-qing1, HAN Qing-an1*   

  1. 1. Hebei Provincial Center for Animal Disease Control and Prevention, Shijiazhuang 050035, China;
    2. China Animal Health and Epidemiology Center, Qingdao 266032, China;
    3. Inspection and Quarantine Technical Center, Hebei Entry-Exit Inspection and Quarantine Bureau, Shijiazhuang 050051, China;
    4. Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    5. College of Veterinary Medicine, Hebei Agricultural University, Baoding 071001, China
  • Received:2017-07-21 Online:2018-03-23 Published:2018-03-23

Abstract:

To understand the epidemiology of the pigs diarrhea virus in Hebei province, a total of 1 855 clinical samples were collected from April, 2016 to February, 2017 and subjected to detection of porcine epidemic diarrhea virus (PEDV), transmissible gastroenteritis virus (TGEV) and porcine rotavirus (PoRV) by real-time PCR. Spike (S) genes of nine amplified PEDV were sequenced and analyzed. The results showed that positive rate of diarrhea was 9.70% and highest in winter and spring seasons. The positive rates of PEDV of total diarrhea samples, piglets diarrhea samples and fattening pigs diarrhea samples were 13.89%, 19.28% and 17.24%, respectively. The phylogenetic analysis of PEDV S genes amino acid sequence showed that the detected 9 S genes from Hebei were distributed in two branches of group Ⅱ. The detail analysis showed several unique amino acid mutations including deletions and insertions in the 9 S genes. These results indicate PEDV infection has fell on piglets but rise on fattening pigs, and the genetic diversity and mutations of S genes were potentially cause alternations of pathogenesis and antigenicity of pandemic PEDV in Hebei province.

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