title: Responses to one or two doses of a deoxycholate subunit influenza vaccine in a primed population.
abstract: A trial with a trivalent influenza subunit vaccine prepared with sodium deoxycholate was carried out in 88 volunteers between May and November 1981. Each haemagglutinin antigen was present at 7 micrograms per dose. Fourfold or greater haemagglutination inhibition antibody (HI) responses to the H1N1 virus A/Brazil/11/78 occurred in 70% of volunteers following a single dose. For the H3N2 virus A/Bangkok/1/79 and B/Singapore/222/79 these figures were 52 and 11%, respectively. No increase in the antibody titre was noted to any of the antigens following a second vaccination dose. Antibody levels remained relatively constant six months after vaccination. A response to B/Singapore/222/79, comparable with the HI response for the influenza A antigens, was noted when serum titres were estimated by a plaque reduction procedure. No neuraminidase inhibition antibody could be detected in response to either A/Brazil/11/78 or A/Bangkok/1/79. No reactions specifically attributable to the vaccine occurred after either injection. A lower HI response to A/Brazil/11/78 was noted in volunteers 52 years of age and older, who also showed less evidence of earlier priming to this virus. Levels of nasal wash neutralizing antibodies to A/Brazil/11/78 were proportional to those detected in sera by HI tests, but were present in smaller amounts.
mesh_terms: D000293:Adolescent; D000328:Adult; D000914:Antibodies, Viral / Q000032:analysis; D000917:Antibody Formation; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D009980:Influenza A virus / Q000276:immunology; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000494:pharmacology*; D007251:Influenza, Human / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009439:Neuraminidase / Q000037:antagonists & inhibitors
chemical_list: D000914:Antibodies, Viral; D007252:Influenza Vaccines; D009439:Neuraminidase