<p>Event-Based Surveillance (EBS) is a surveillance system that provides faster and real-time information, which can improve the speed of triggering Early warning mechanisms as well as the response to Public Health Events (PHE). Recent infectious disease outbreaks have revealed weaknesses in surveillance systems as well as shortcomings in indicator-based surveillance and the need to strengthen the analysis of information from all sources outside the health care system in ECOWAS countries. This study aims to assess the implementation of EBS in ECOWAS countries.</p>