Raccoon poxvirus feline panleukopenia virus VP2 recombinant protects cats against FPV challenge

Virology
L HuF W Scott

Abstract

An infectious raccoon poxvirus (RCNV) was used to express the feline panleukopenia virus (FPV) open reading frame VP2. The recombinant, RCNV/FPV, was constructed by homologous recombination with a chimeric plasmid for inserting the expression cassette into the thymidine kinase (TK) locus of RCNV. Expression of the VP2 DNA was regulated by the vaccinia virus late promoter P11. Southern blot and polymerase chain reaction (PCR) analyses confirmed the cassette was in the TK gene of the RCNV genome. An immunofluorescent antibody assay using feline anti-FPV polyclonal serum showed the expressed viral antigen in the cytoplasm of infected cells. Radioimmunoprecipitation with the same antiserum detected a 67-kDa VP2 protein which exactly matched the migration of the authentic FPV VP2 protein by SDS-polyacrylamide gel electrophoresis. Nine five-month-old cats were vaccinated and 21 days later were boosted with the recombinant virus. Peroral FPV challenge 2 weeks after the booster showed that the cats were fully protected as measured by examining clinical signs and total white blood cell counts in peripheral blood. Cats not immunized developed low to very low leukocyte counts following peroral FPV challenge. The nine vaccinated cats showe...Continue Reading

Citations

Apr 9, 2015·Viruses·Lucas Sánchez-SampedroMariano Esteban
Jun 19, 2004·Journal of Drug Targeting·Jorge E OsorioDan T Stinchcomb
May 1, 1997·The Journal of Veterinary Medical Science·N YokoyamaT Mikami
Jul 11, 1998·Journal of Virology·Y IkedaT Mikami

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