title: Recombinant yeast hepatitis B vaccine compared with plasma-derived vaccine: immunogenicity and effect of a booster dose.
abstract: The immunogenic effect of recombinant yeast and plasma-derived hepatitis B vaccines administered at 0, 1 and 6 months was evaluated in 334 seronegative health professionals. The seroconversion rates following 10 micrograms, 5 micrograms and 2.5 micrograms doses of recombinant vaccine were similar to those observed after 20 micrograms doses of plasma-derived vaccine. The geometric mean antibody titres (G.M.T.) induced by 10 micrograms and 5 micrograms doses of recombinant vaccine were similar to those observed after 20 micrograms doses of plasma-derived vaccine. The G.M.T. values were lowest after 2.5 micrograms doses of recombinant vaccine. However, the recipients of the 2.5 micrograms had a significant anti-HBs response after a fourth (booster) dose of recombinant vaccine was given at 12 months. A booster dose of recombinant hepatitis B vaccine was given to 31 health professionals who had been successfully immunised with plasma-derived vaccine 5-7 years previously. A significant anamnestic response was observed in 30 (97%) of these individuals in spite of the fact that 16 (52%) had low or undetectable levels of anti-HBs before the booster dose was given.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006510:Hepatitis B Antibodies / Q000032:analysis; D017325:Hepatitis B Vaccines; D006801:Humans; D007115:Immunization Schedule; D007117:Immunization, Secondary; D008297:Male; D008875:Middle Aged; D011994:Recombinant Proteins; D014761:Viral Hepatitis Vaccines / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D006510:Hepatitis B Antibodies; D017325:Hepatitis B Vaccines; D011994:Recombinant Proteins; D014761:Viral Hepatitis Vaccines