Accelerated viraemia in cats vaccinated with fixed autologous FIV-infected cells. Abstract 2nd International Feline Immunology Workshop, 31 July-3 August 1997, Davis, USA.
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We have vaccinated cats with fixed autologous FIV infected PBMC to determine whether autologous presentation of antigen is capable of inducing a protective immune response against homologous challenge. To this end autologous PBMC were infected with a FIV molecular clone (19k1). When infection was established, cells were inactivated by dialysis against paraformaldehyde. Upon vaccination, cats developed a virus specific immune response as measured by ELISA against the Gag protein of FIV. No antibodies against the envelope protein were detected with a peptide ELISA. Virus neutralizing antibodies however could be detected with a neutralization assay based on infection of CrFK cells, but not in an assay based on infection of primary T-cells. Although vaccination led to the induction of these virus-specific immune responses, vaccinated cats were not protected against homologous challenge but showed an accelerated viraemia upon infection. This was shown both by PCR and cell-associated viral load. The possible mechanisms underlying this observation are discussed in this paper.
- Antibodies, Viral/analysis
- Viral Load
- DNA Primers/chemistry
- DNA, Viral/analysis
- Polymerase Chain Reaction/veterinary
- Blood Component Transfusion
- Blood Transfusion, Autologous
- Feline Acquired Immunodeficiency Syndrome/immunology/*prevention & control
- Immunodeficiency Virus, Feline/genetics/*immunology
- Viral Vaccines/*administration & dosage