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Figure 1. A 35-year-old man presented with epigastric pain of several months' duration. An esophagogastroduodenoscopy revealed an active duodenal ulcer. Biopsy of the gastric antrum showed chronic active gastritis with innumerable Helicobacter pylori organisms on the gastric mucosa. This photomicrograph of a section of an antral-biopsy specimen (x1000) stained with the Genta stain (a triple stain consisting of a modified Steiner, hematoxylin and eosin, and Alcian blue; pH 2.5) shows a gastric pit virtually filled with H. pylori. Culture confirmed that the infecting organism was H. pylori. The patient was treated for two weeks with . . . [Full Text of this Article]