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Granulomatous colitis in a 2-year-old English bulldog. (A) Endoscopic image of severe colonic granularity (increased texture) involving the descending colon. (B) Colonic biopsy from this dog shows clusters (yellow fluorescence) of mucosal associated E. coli following fluorescence in situ hybridization. From: Jergens et al. (125), with permission.
