Helicobacter Infections [Disease/Finding] Infections, Helicobacter C7016 Infections with organisms of the genus HELICOBACTER, particularly, in humans, HELICOBACTER PYLORI. The clinical manifestations are focused in the stomach, usually the gastric mucosa and antrum, and the upper duodenum. This infection plays a major role in the pathogenesis of type B gastritis and peptic ulcer disease. D016481 Helicobacter Infections Helicobacter Infections M0025165 C0079487 N0000003419 989696 Gram-Negative Bacterial Infections [Disease/Finding]