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Immunoglobulin A (IgA) antibodies to varicella-zoster virus (VZV) were measured in sera from subjects with acute varicella and herpes zoster, VZV-immune subjects remote from infection, and recipients of a live attenuated varicella vaccine, using a solid-phase radioimmunoassay. Primary infection with VZV was associated with early production of IgA antibodies. Among 36 subjects with varicella tested 1 to 5 days after onset, 22 had detectable IgA, and all of the negative sera were obtained before day 3 of the varicella exanthem. VZV IgA was detected in one of three sera obtained more than 60 days after onset of the illness. Four of five sera obtained from subjects within 1 week of the onset of herpes zoster had measurable levels of IgA. Between 1 and 4 weeks after onset of zoster, all 10 subjects tested had detectable IgA to VZV. VZV IgA was detected as late as 63 days after the onset of herpes zoster. Of 10 vaccine recipients, 5 developed VZV IgA which was detected as early as 4 weeks and persisted for as long as 16 weeks after vaccination. VZV IgA was not detected in sera from 42 children who had no detectable IgG antibody to VZV. VZV IgA was found on only 3 of 23 sera from adults who had varicella more than 20 years before.

Serum immunoglobulin A antibody to varicella-zoster virus in subjects with primary varicella and herpes zoster infections and in immune subjects