Use of the unlabeled antibody immunohistochemical technique for the detection of human antibody.

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Abstract
Two methods have been developed which permit use of the unlabeled antibody immunohistochemical technique for detection of human antibody, without the need for immunization of humans with peroxidase. Human antibody to herpes simplex virus (HSV) reacted with human cell cultures infected with HSV was the experimental system. In the first method an attempt was made to employ rabbit peroxidase-antiperoxidase (PAP) soluble complexes in connectin with human antibody. This was done by sequential addition to the HSV-infected cells of (a) human anti-HSV, (b) rabbit antihuman globulin, (c) guinea pig antirabbit globulin (the bridging reagent) and (d) rabbit PAP. Strong specific staining of HSV-infected cells was obtained; however, difficulties were encountered with nonspecific reactions on uninfected cells. In the second method PAP soluble complexes prepared with baboon antiperoxidase were bridged to the human anti-HSV antibody by rabbit antihuman globulin. Because of the phylogenetic relatedness of human and baboon globulins this resulted in firm binding which gave strong specific staining of HSV-infected cells without significant reaction in uninfected cells.

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