Live attenuated and inactivated influenza vaccine in school-age children

W. C. Gruber, L. H. Taber, W. P. Glezen, R. D. Clover, T. D. Abell, R. W. Demmler and R. B. Couch
Department of Microbiology and Immunology, Baylor College of Medicine, Houston, Tex.

In 1985, we enrolled 189 school-age children by family in a double-blind study to determine protection against influenza by a single dose of cold-recombinant bivalent A vaccine or commercial trivalent inactivated vaccine compared with placebo. All children in school or day care, 3 to 18 years of age, in an enrolled family received the same preparation. Following vaccination, 60% and 21% of cold-recombinant bivalent A vaccine recipients and 73% and 83% of trivalent inactivated vaccine recipients demonstrated fourfold or greater response in hemagglutination-inhibition antibody titer to A/H1N1 and A/H3N2, respectively. Sixty-seven percent of all trivalent inactivated vaccine recipients demonstrated a fourfold or greater serologic response to H1N1, H3N2, and influenza B following a single dose of vaccine. During the 1985-1986 influenza B/Ann Arbor epidemic, heterotypic protection afforded by the influenza B/USSR component of trivalent inactivated vaccine was 62% compared with placebo. A single dose of trivalent inactivated vaccine protected school-age children, 6 to 19 years of age, from influenza B infection; the rate of protection was 64% against infection and 73% against febrile illness.

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