Abstract:
:Porcine epidemic diarrhea virus (PEDV) causes significant loss to the swine industry. The emergence of novel PEDV strains in recent years has decreased the effectiveness of PEDV vaccines. We have developed a live recombinant vaccine, a swinepox virus vector that expresses a truncated S protein (rSPV-St) from a recent PEDV strain, SQ2014, and evaluated its immunogenicity and effectiveness in a swine model. Vaccination of swine with rSPV-St elicited a robust antibody response specific for the homologous PEDV SQ2014. Serum IgA titers in rSPV-St-vaccinated animals were significantly higher than in those immunized with inactivated vaccines. The effectiveness of antibodies induced by the rSPV-St vaccine in protection against PEDV was tested in a passive-transfer model in which piglets were challenged with the homologous virus SQ2014 and the heterologous strain CV777. When challenged with the homologous virus, sera from rSPV-St vaccination provided complete protection. However, sera from rSPV-St vaccination did not provide any protection against the heterologous virus challenge. Amino acid sequence differences in the S proteins of the two viruses were identified within neutralizing epitopes, which might have contributed to the divergent clinical results. Our data suggest that rSPV-St is potentially an effective vaccine against infection with emerging PEDV strains.
journal_name
Arch Viroljournal_title
Archives of virologyauthors
Yuan X,Lin H,Li B,He K,Fan Hdoi
10.1007/s00705-017-3548-1subject
Has Abstractpub_date
2017-12-01 00:00:00pages
3779-3789issue
12eissn
0304-8608issn
1432-8798pii
10.1007/s00705-017-3548-1journal_volume
162pub_type
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