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b型流感杆菌（Hib）结合菌苗的价格限制了它在发展中国家的应用。为了建立更经济的接种方案,作者进行了替代常规3针免疫的接种方案的免疫原性的随机试验。
The price of Hib combined with the vaccine limits its use in developing countries. In order to establish a more economical vaccination program, the authors conducted a randomized trial of the immunogenicity of alternative vaccination regimens for conventional 3-needle immunization.