1前言依据为各成员国提供卫生政策方面指导意见这一职责,世界卫生组织(WHO)就预防具有全球公共卫生影响的疾病的相关疫苗及联合疫苗,发布一系列定期更新的立场文件。这些文件着重关注疫苗在大规模免疫规划项目中的使用。文件归纳了相关疾病和疫苗的基本背景信息,并就如何在全球使用这些疫苗表明了WHO目前的 1 Introduction Based on its responsibility to provide guidance to member states on health policies, the World Health Organization (WHO) issued a series of regularly updated position papers on vaccines and combination vaccines to prevent diseases with global public health impact. These documents focus on the use of vaccines in large-scale immunization programs. The document summarizes the basic background information on related diseases and vaccines and shows how the WHO currently uses these vaccines