(A) Mixed inflammatory infiltrate in the lamina propria (H&E; magnification, ×100). (B) Paucity of crypts, crypt distortion, cryptitis, and abundant apoptotic bodies (H&E; magnification, ×100). (C) High-resolution image of apoptotic bodies (arrows); abundant eosinophils can also be observed (H&E; magnification, ×300). (D) In situ hybridization for EBER; arrows point to positive signals in epithelial cell nuclei (magnification, ×200).