WHO世界卫生组织：2024年天花和天花病毒（正痘病毒）：世卫组织立场文件（英文版）

In accordance with its mandate to provide normative guidance to Member States on health policy matters, WHO issues a series of regularly updated position papers on vaccines and combinations of vaccines against diseases that have an international public health impact. These papers are concerned primarily with the use of vaccines in large-scale vaccination programmes. The position papers are intended for use by national public health officials and managers of immunization programmes. They may also