Recombinant canarypox virus vaccine co-expressing genes encoding the VP2 and VP5 outer capsid proteins of bluetongue virus induces high level protection in sheep

Vaccine. 2007 Jan 8;25(4):672-8. doi: 10.1016/j.vaccine.2006.08.025. Epub 2006 Sep 5.

Abstract

We describe the development and preliminary characterization of a recombinant canarypox virus vectored vaccine for protective immunization of ruminants against bluetongue virus (BTV) infection. Sheep (n=6) immunized with recombinant canarypox virus vector (BTV-CP) co-expressing synthetic genes encoding the two outer capsid proteins (VP2 and VP5) of BTV serotype 17 (BTV-17) developed high titers (40-160) of virus-specific neutralizing antibodies and were resistant to challenge with a field strain of BTV-17. In contrast, sheep (n=5) immunized with a commercial recombinant canarypox virus vector expressing the E and preM genes of West Nile virus were seronegative to BTV and developed pyrexia, lymphopenia, and extended, high-titered viremias following challenge exposure to the field strain of BTV-17. These data confirm that the BTV-CP vaccine may be useful for the protective immunization of ruminants against bluetongue, and it may avoid the problems inherent to live-attenuated (LA) BTV vaccines.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Bluetongue / prevention & control*
  • Bluetongue virus / immunology
  • Bluetongue virus / metabolism*
  • Canarypox virus / genetics
  • Canarypox virus / metabolism*
  • Capsid Proteins / immunology*
  • Capsid Proteins / metabolism
  • Female
  • Gene Expression Regulation, Viral
  • Male
  • Sheep
  • Time Factors
  • Viral Vaccines / immunology*

Substances

  • Capsid Proteins
  • VP2 protein, Bluetongue virus
  • VP5 protein, Bluetongue virus
  • Viral Vaccines