1887

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Volume 105, Issue 1

Elucidating the biological characteristics and pathogenicity of the highly virulent G2a porcine epidemic diarrhea virus No Access

Abstract

Since the large-scale outbreak of porcine epidemic diarrhoea (PED) in 2010, caused by the genotype 2 (G2) variant of the porcine epidemic diarrhoea virus (PEDV), pig farms in China, even those vaccinated with the G2b vaccine, have experienced infections from the G2a variant, leading to significant economic losses. This study successfully isolated the G2a strain DY2020 from positive small intestine contents (SICs) by blind passage on Vero cells for four generations. The SICs were taken from Daye, Hubei Province, China. The biological characteristics were identified by indirect immunofluorescence assay (IFA) and transmission electron microscopy (TEM). The growth kinetics of the strain on Vero cells were detected by TCID, and the virus titre could reach 10 TCID ml (SD: 5.07×10). The pathogenicity towards colostrum-deprived piglets was conducted by assessing faecal viral shedding, morphometric analysis of intestinal lesions, and immunohistochemical staining. The results showed that DY2020 was highly virulent to colostrum-deprived piglets, with severe watery diarrhoea and other clinical symptoms appeared at 6 h post-infection (h p.i.), and all died within 30 h. Pathological tissue examination results showed that the lesions mainly occurred in the intestines of piglets, causing pathological changes such as shortening of intestinal villi. In summary, the discovery of the G2a strain DY2020 in this study is of great significance for understanding Hubei PEDV and provides an important theoretical basis for the development of new efficient PEDV vaccines.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): highly virulence , pathogenicity and porcine epidemic diarrhea virus
Funding
This study was supported by the:
  • Innovative Research Group Project of the National Natural Science Foundation of China (Award 32302866)
    • Principle Award Recipient: ChangLi
© 2024 The Authors
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/content/journal/jgv/10.1099/jgv.0.001953
2024-01-25
2024-05-15
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Elucidating the biological characteristics and pathogenicity of the highly virulent G2a porcine epidemic diarrhea virus
J. Gen. Virol. 105, 001953 (2024); https://doi.org/10.1099/jgv.0.001953
/content/journal/jgv/10.1099/jgv.0.001953
/content/journal/jgv/10.1099/jgv.0.001953
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