Hepatitis B Vaccine Clinical Trial
Official title:
Long-term Persistence of Immunity to Hepatitis B in Adults Vaccinated 20 to 30 Years Ago With Engerix-B
The purpose of this study is to assess the long-term protection against HBV infection in adult subjects, aged 18-40 years vaccinated with three or four doses of Engerix-B 20 to 30 years ago
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