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J Virol. 1990 November; 64(11): 5652-5655

Immunologic abnormalities in pathogen-free cats experimentally infected with feline immunodeficiency virus.

Department of Medicine, University of Alabama, Birmingham 35294.

ABSTRACT

Blood mononuclear cells from 47 cats experimentally infected with feline immunodeficiency virus (FIV) were examined by using monoclonal antibodies directed against feline CD4 and CD8 homologs, a pan-T-cell antigen, and cell surface immunoglobulin. Significant inversion of the CD4+/CD8+ T-cell ratio was observed only in cats that were infected for 18 months or more. This inversion was associated with a decrease in the absolute numbers of CD4+ T cells and a concomitant increase in CD8+ cells. However, the total numbers of circulating T and B cells were not significantly reduced. Cats infected with FIV for 24 to 28 months also had significantly elevated levels of serum immunoglobulin G (IgG), but normal levels of IgA and IgM. The long-term decline in CD4+ T cells and hypergammaglobulinemia observed in FIV-infected cats resemble the abnormalities occurring in humans after human immunodeficiency virus infection.

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