title: Clinical trials of bivalent influenza A/New Jersey/76-A/Victoria/75 vaccines in the elderly.
abstract: This placebo-controlled evaluation in elderly persons of inactivated influenza virus vaccines containing 200 or 400 chicke cell-agglutinating units of both A/New Jersey/76 and A/Victoria/75 antigens revealed mild systemic reactions in 7.8% and moderate reactions in 4.9% of vaccinees. These reactions were more common after administration of whole-virus than subvirion vaccines, more frequent in females than males, and more frequent in persons with low initial titers of antibody to A/New Jersey antigen. Local inflammation occurred in 18.7% of vaccinees (predominantly females) and frequently was seen with systemic reactions, but did not correlate with antibody response. Titers of antibody to A/New Jersey antigen were initially high and 99% of vaccinees had titers of greater than 1:20 after vaccination. Titers of antibody to A/Victoria antigen were initially low, and 56% of vaccinees had titers of greater than 1:20 after vaccination. Fourfold or greater increases in titer occurred in about 50% of vaccinees for each virus, most often concomitantly. Antibody responses to subvirion and whole-virus vaccines were similar, and increased responses with higher doses coincided with increased reactogenicity. Later revaccinations because of low titers of A/Victoria antibody produced negligible antibody responses.
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D000914:Antibodies, Viral / Q000096:biosynthesis; D002986:Clinical Trials as Topic; D004306:Dose-Response Relationship, Immunologic; D004311:Double-Blind Method; D004739:England; D004890:Erythema / Q000209:etiology; D005260:Female; D005334:Fever / Q000209:etiology; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D009980:Influenza A virus / Q000276:immunology*; D007252:Influenza Vaccines / Q000009:adverse effects / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009515:New Jersey
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines