The report aims to provide a critical review of evidence on the barriers and drivers of seasonal influenza vaccination coverage in the EU/EEA. The report focuses on high-risk groups where high coverage of seasonal flu vaccination is most important. The 2009 Council of the European Union Recommendation on seasonal influenza vaccination encourages countries to implement measures that would increase seasonal influenza vaccination uptake to at least 75% for defined older age groups, and, if possible, for other risk groups. In support of this, the ECDC report summarises the evidence on what are the barriers and what are the drivers for seasonal influenza vaccination by each risk group