China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (8): 2982-2989.doi: 10.16431/j.cnki.1671-7236.2021.08.031

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification and Pathogenicity of Porcine Deltacoronavirus Strain HeN10

WANG Zhiyan, SUN Yujie, XU Xin, HUANG Baicheng, TIAN Kegong   

  1. National Research Center for Veterinary Medicine, Luoyang 471003, China
  • Revised:2021-02-11 Online:2021-08-20 Published:2021-08-19

Abstract: The purpose of this study was to obtain clinical isolates of Porcine deltacoronavirus (PDCoV) and investigate the biological characteristics and pathogenicity of the coronavirus.The swine testicle (ST) cells were used for PDCoV isolation with the PDCoV positive samples obtained clinically from a pig farm in Henan province.The isolated virus was identified by cytopathic effect (CPE) observation, RT-PCR, indirect immunofluorescence (IFA), electron microscopy, and sequence analysis of spike (S) gene, in addition, the pathogenicity was also evaluated using piglets.The PDCoV in the ST cell was successively passaged for 10 passages and confirmed by RT-PCR.The CPE (cell shrinkage, net pulling, fragmentation, and shedding) could be observed in the ST cells from the 4th passage.The isolated virus were identified by IFA, and typical crown shaped viral particles were observed by negative staining in electron microscope, and then the strain of PDCoV was named HeN10.The S gene of HeN10 had the highest sequence identity with China SD strain (99.8%), within the same branch of domestic prevalent strains phylogenetically, such as CHN-JS-2017 and CHN-HeB1-2017.The results of animal test showed that the virus (oral inoculation at a dose of 5×106.3 TCID50/piglet) was highly pathogenic by causing watery diarrhea in 10-day-old piglets (5/5).Overall, the PDCoV HeN10 strain was successfully isolated, it showed high sequence identity with domestic prevalent strains such as SD, and also showed high pathogenicity in piglets, which providing a foundation for the development of diagnostic methods and vaccines.

Key words: Porcine deltacoronavirus (PDCoV); isolation and identification; sequence analysis; pathogenicity

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