Helicobacter pylori planting in stomach mucosa is now recognized as the most widespread human pathogen . approximately half of the world ' s population is infected . the infection of h . pylori is highly associated with chronic active gastritis , peptic ulcers , gastric adenocarcinoma and lymphoma of the mucosa - associated lymphoid tissue ( malt ) . in 1994 , who ranked h . pylori as i grade carcinogen 幽门螺杆菌( helicobacterpylori ， hp )是定植于人胃粘膜的重要致病菌，全球感染率高达50以上，与慢性胃炎、胃十二指肠溃疡及胃粘膜相关淋巴组织淋巴瘤的发生、发展密切相关， 1994年世界卫生组织( who )将幽门螺杆菌定为类致癌因子。
