Fig. 2

Gastric biopsy shows H. pylori-associated chronic active gastritis with scattered small lymphocytes and plasma cells; a lymphoid follicle with a reactive germinal center and a slightly expanded marginal zone (a, H&E, original magnification 100 X). Immunostaining of H. pylori shows intra-foveolar bacteria with curving configuration, characteristic of H. pylori (b, immunohistochemical stain of H. pylori, original magnificantion 1000 X)