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Proposed algorithm for decision on initiation of antiviral therapy in a ulcerative colitis patient with histological evidence of cytomegalovirus in the colonic mucosa. 1Unclear whether antiviral treatment should be tapered/stopped. UC: Ulcerative colitis; HE: Hematoxylin-eosin staining; IHC: Immunohistochemistry; CMV: Cytomegalovirus.
