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作者应用荷兰制备的加热灭活的乙型肝炎疫苗,对800名易感的男性同性恋者进行双盲对照研究。疫苗系由含HBsAg ad和ay两种亚型的混合血浆提纯,经101～104.5℃
The authors used a heat-inactivated hepatitis B vaccine prepared in the Netherlands to conduct a double-blind controlled study of 800 susceptible gay men. The vaccine was purified from mixed plasma containing both HBsAg ad and ay subtypes,