虽然还有数家企业也在生产乙脑疫苗，但中国产的这款单剂型疫苗是首个获批用于儿童患者身上的此类疫苗，这为该产品参与低价非专利药竞争铺平了道路。
While several other manufacturers make similar JE vaccines, the new single-dose Chinese product is the first to be approved for paediatric use and paves the way for cut-price generic competition.
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。
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.
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