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为了解由卫生部生物制品总公司协作组和长春生物制品研究所等单位研制的吸附精制百白破混合制剂（aPDT）的免疫持久性和加强免疫的时间，在浙江省余杭县选择了3～5月龄健康婴幼儿，按随机双盲分成两组，分别注射aPDT和吸附全菌体百白破混合制剂（aPDT）进行比较。每组IOO人左右
In order to understand the immunopurification and immunization time of the adsorbed purified diphtheria biloba mixture (aPDT) developed by the collaborating group of Ministry of Health Biological Products Corporation and Changchun Institute of Biological Products, Five-month-old healthy infants and young children were randomly divided into two groups according to randomized double-blind aPDT and aPDT. Around IOO each group