title: Immunologic evidence of reinfection with varicella-zoster virus.
abstract: Resistance to reinfection with varicella-zoster virus (VZV) was evaluated in immune adults who had household exposure to varicella. Sixty-four percent of 25 adults exposed to varicella had a fourfold or greater rise in IgG antibody to VZV or had a high initial IgG antibody titer to VZV that declined by fourfold. IgM antibody was detected in only 12% of 25 VZV-immune subjects. Seventy percent of 23 subjects exposed to varicella had IgA antibody to VZV compared with 13% of 23 subjects with antibody to VZV who had no recent exposure (P less than 0.001, chi 2 test). Enhanced cellular immunity was documented by an increase in lymphocyte transformation to VZV antigen from a mean +/- SE index of 7.8 +/- 1.30 to 15.3 +/- 2.56 (P = 0.01, paired t-test). The increase in immunity to VZV in many immune subjects exposed to VZV suggests the occurrence of subclinical reinfection.
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000032:analysis*; D000956:Antigens, Viral / Q000276:immunology; D002644:Chickenpox / Q000276:immunology*; D005260:Female; D014645:Herpesvirus 3, Human / Q000276:immunology*; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008213:Lymphocyte Activation; D012008:Recurrence; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M