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作者对保存于4℃已2年的3批甲型肝炎(HA)疫苗和1批新制备的疫苗的反应原性和免疫原性进行了随机双盲对照研究。
The authors conducted a randomized double-blind controlled study of the reactivity and immunogenicity of three batches of Hepatitis A (HA) vaccine and one newly prepared vaccine stored at 4 ° C for two years.