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目的是评价一种含有成人疫苗半倍量抗原的新型灭活甲型肝炎（简称甲肝）疫苗的安全性和免疫原性． 方法 选５３７名不同性别的健康儿童作为研究对象，分为三个年龄组：１２～４７月龄、４～８岁和９～１５岁．曾接受过生长激素或人免疫球蛋白治疗，对任何疫苗有变态反应或近３
The purpose is to evaluate the safety and immunogenicity of a novel inactivated Hepatitis A (Hepatitis A) vaccine containing a half-fold amount of antigen in an adult vaccine. Methods 537 healthy children of different sexes were selected as research objects and divided into three age groups: 12 to 47 months old, 4 to 8 years old and 9 to 15 years old. Have received the treatment of growth hormone or human immunoglobulin, allergic to any vaccine or nearly 3