Abstract
Thirty-eight elderly female subjects (aged 80 +/- 7 years, mean +/- standard deviation) were randomized to immunization with trivalent inactivated influenza virus vaccine containing either purified surface antigen (n = 18) or whole virus (n = 20) components from A/Texas/36/91 (H1N1), A/Beijing/353/89 (H3N2), and B/Panama/45/90 strains. Humoral and cellular immune responses were assessed by measuring serum hemagglutination inhibition antibodies and cytotoxic T lymphocyte (CTL) activity at 0 and 3 weeks postvaccination. Serological responses to both of the type A vaccine strains following immunization with surface antigen vaccine (SAV) were significantly more frequent and greater in magnitude than those induced by whole-virus vaccine. Antibody responses to the B/Panama component were modest and did not differ significantly between the two vaccines. Persons given SAV, but not those given whole-virus vaccine, had a small ¿ but significant increase in mean percent specific lysis of influenza A (H1N1) virus-infected autologous targets by peripheral blood mononuclear cells which were stimulated in vitro with influenza A (H1N1) virus. The H1N1-stimulated cytotoxic effectors induced by SAV were CD8+ and were not cross-reactive against H3N2-infected targets. Influenza B virus-specific CTL responses were not observed with either vaccine. These results suggest that currently available subunit influenza virus vaccines may offer an advantage over inactivated whole-virus preparations for inducing humoral and cellular immune responses in the elderly, although the CTL response may be too limited to be of physiological significance.
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Selected References
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