Objective To determine the persistence of immune protection of China-made, plasma-derived hepatitis B vaccine in infants and the time table of booster immunization.
目的确定国产乙肝血源疫苗低剂量免疫保护持久性及用重组酵母乙肝疫苗加强免疫的免疫应答。
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The plasma Protein therapeutics Association (PPTA) is the primary advocate for the world's leading source plasma collectors and producers of plasma-derived and recombinant biological therapeutics.