WHO世界卫生组织：2025年利用开源信息定制基于事件的监测：大规模集会的实际指南报告（英文版）

Public health intelligence (PHI) is key to early warning alert and response (EWAR), and is vital in protecting the health of the populations in the context of mass gatherings (MGs). PHI allows rapid identification, collection, synthesis, analysis, assessment, interpretation and generation of a wide range of information. This information, including event-based surveillance (EBS), enables actionable insights and their dissemination for informed decision-making. This practical guide describes th