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The introduction and broad use of new immunosuppressive agents, including biologic agents and JAK inhibitors, have revolutionised treatment of inflammatory bowel disease [IBD] in recent decades. With such immunosuppression, the potential for opportunistic infection is a key safety concern. Opportunistic infections pose particular problems for the clinician; they are potentially serious, often difficult to recognise, associated with appreciable morbidity or mortality, and are challenging to treat effectively. The first guideline on opportunistic infections was published in 2009 1 followed by an update in 2014. 2 New evidence in this field and in vaccination strategies for immunosuppressed IBD patients led the European Crohn’s and Colitis Organization [ECCO] to update the previous consensus on opportunistic infections in IBD. The current document is focused on viral, mycobacterial, bacterial, fungal, and parasitic …