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  • Title: Quantitation of specific antibodies bound to feline leukemia virus in the plasma of pet cats.
    Author: Snyder HW, Singhal MC, Yoshida LH, Jones FR.
    Journal: Mol Immunol; 1985 Aug; 22(8):863-70. PubMed ID: 2995795.
    Abstract:
    A method is described for determining levels of circulating immune complexes (CIC) composed of feline leukemia virus (FeLV) antigens and corresponding antibodies in plasma of persistently-infected pet cats. The procedure is based on the ability of high-titered heterologous anti-FeLV serum to chase cat anti-FeLV IgG from dissociated CIC by successfully competing for binding of free antigen. The eluted cat antibody is then collected and quantitated. In a study of cats in the process of clearing persistent FeLV infections, measured levels of FeLV-specific CIC correlated well with fluctuating levels of free FeLV antigen and antibody. The Raji cell assay for CIC in those cats was of comparatively little value in following the clearance of the virus, presumably because that assay does not distinguish between CIC containing viral and those containing non-viral antigens. The method described can be adapted to studies of specific immune complexes associated with a variety of syndromes, provided that the antigen eliciting the immune response is known.
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