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The proliferative response of peripheral blood mononuclear cells (PBMC) from healthy adults to human herpesvirus-6 (HHV-6) was examined. It was found that PBMC from 13 of 14 HHV-6-seropositive adults apparently proliferated in response to stimulation with HHV-6 antigen in contrast to the lack of response of cord blood mononuclear cells. In order to confirm the presence of HHV-6-specific memory T cells in the peripheral blood of healthy adults, we established HHV-6-specific T-cell clones from an HHV-6-seropositive individual. CD4+ T-cell clones generated from HHV-6-stimulated PBMC were found to proliferate upon stimulation with HHV-6 in the presence of autologous antigen-presenting cells, but not in response to herpes simplex virus type 1 antigen or mock-infected control antigen. These results indicate that a T-cell immune response against HHV-6 infection is generally present in healthy adult populations.
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