Abstract
Antibody-dependent cell-mediated cytotoxicity (ADCC) against cryopreserved varicella-zoster virus-infected human foreskin fibroblasts was detected in a 51Cr release assay. Target cells, samples of seropositive or seronegative sera, and mononuclear cells obtained by Ficoll-Hypaque centrifugation of human peripheral blood were added to microtiter plate wells and allowed to incubate at 37 degrees C for 4 h. Fibroblasts infected for 48 to 96 h were susceptible to ADCC. Effector cells from seropositive and seronegative normal children were equally active in the assay. Antibody titers were determined by testing serial dilutions of sera in the ADCC assay. Zoster immune globulin had a titer of 204,800. Sera from 40 naturally seropositive individuals were compared by assays for ADCC and fluorescent antibody to membrane antigen. All sera that were negative by fluorescent antibody to membrane antigen (less than 2) were also negative by ADCC (less than 20). All sera that were positive by fluorescent antibody to membrane antigen were also positive by ADCC, but titers of individual sera were frequently 5 to 20 times higher in the ADCC assay.
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