Abstract
The present studies were designed to evaluate possible efficacy of specific human transfer factor (TF) in preventing or attenuating varicella-zoster (VZ) infection in children with acute lymphocytic leukemia (ALL). TF was prepared following leukapheresis of adult donors who were convalescing from chicken pox. Recipients were VZ seronegative children with ALL, 12 in remission and 3 in relapse; a single injection of TF was given equivalent to 10 8 lymphocytes per 7 kg body wt. The following VZ-specific parameters were measured: lymphocyte blastogenesis, cytotoxicity and leukocyte inhibitory factor (LIF) production, and indirect fluorescent and CF antibody titers. No patients in relapse converted immune response while 10 12 in remission developed positive reactivity in at least one assay of cell-mediated immunity (CMI); 3 12 were positive in all three parameters of CMI and 8 12 in two assays. Cytotoxicity was the most consistently positive test following TF administration. No patients developed VZ antibody. Seventeen months follow-up has demonstrated persistent cellular immunity.
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