The European Congress of Immunology - ECI - is the triennial joint meeting of all EFIS member societies. It is now one of the most highly-regarded international conferences in the field of basic and clinical immunology, attracting on average more than 3,200 delegates and offering the highest standards in terms of both scientific and social programs. Following Paris in 2006, Berlin in 2009, Glasgow in 2012 and Vienna in 2015, Amsterdam will play host to the Fifth ECI in 2018. We invite you to join us at the ECI 2018 in Amsterdam and discuss the latest developments in immunological research and clinical therapy. In line with the theme of Building Bridges, sessions will highlight new immunological discoveries with diagnostic or therapeutic promise. In addition, we will connect to other disciplines, like systems biology, multidimensional imaging, and microbiomics to stimulate novel directions of immunological research and therapy. We look forward to welcoming you in Amsterdam!