[Helicobacter pylori: a great discovery].

Within the past decade, there has been an explosion of investigative activity and publications about Helicobacter pylori pathogen. Its role in gastroduodenal diseases is becoming remarkably evident. It is accepted that H. pylori is intimately involved in the pathogenesis of chronic gastritis microbiol/DT and peptic ulcer disease. Furthermore, it is also associated with stomach cancers. The old creed in medical field that "No acid, no ulcer" would probably be changed to "No H. pylori infection, no ulcer". So, the discovery of H. pylori revolutionized our understanding of gastroduodenal diseases.