SUMMARYThe immunogenicity and reactogenicity of two preparations of yeast-derived hepatitis B vaccines were compared in healthy adult populations. The two groups were vaccinated in parallel, but they were not matched for age and sex. All subjects seroconverted, and 9 months after the first vaccine dose, all had anti HBs titres of at least 10 IU/l. The anti-HBs titres were higher in the group of subjects given 20 gtg vaccine antigen made by Smith Kline & RIT (GMT 2943 at 9 months) compared to those who received 10 ,tg of vaccine made by Merck, Sharp & Dohme (GMT 729 at 9 months). Adverse effects were recorded in 32'0 and 44'7 % of the participants, but these were limited to minor local and general reactions. In the present study both preparations were safe and efficient.
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