Disease associations with Helicobacter pylori(HP).The large circle represents a typical population in a developed country where 60% of persons are not infected with H. pylori. The darker circle represents the 40% of persons who are infected with H. pylori. Even so, nearly all the duodenal ulcers and gastric ulcers occur in the H. pylori-positive group. Each year, 1% of infected patients undergo transition from asymptomatic gastritis to symptomatic peptic ulcer. Note that most gastric adenocarcinomas and gastric mucosa-associated lymphoid tissue (B-cell) lymphomas also occur in
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