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Histology of the sigmoid colon biopsy: A) inflammatory cell infiltration, mainly of neutrophils and giant cells, with nuclear inclusion in the colonic mucosa (black arrow, Hematoxylin and Eosin staining, 400× original magnification): B) CMV-infected cells with nuclear inclusion (black arrow) (immunohistochemical stain using anti-CMV monoclonal antibody, 100× original magnification). CMV: cytomegalovirus
