Keyword: gastritis cancer

        Helicobacter pylori is a human bacterial infections are the most common, about half of the world’s population is infected with H. pylori. The people are the only source of infection of Helicobacter pylori, eating unclean food and kissing can lead to Helicobacter pylori infection. Helicobacter pylori cause harm to humans, because it can produce a variety of virulence factors, such as flagella, adhesion molecule, lipopolysaccharide, urease, vacuolating cell toxin and cytotoxic protein, especially in the latter two virulence factors most harmful . Chronically infected with Helicobacter pylori cause chronic active gastritis, and gastric atrophy and intestinal metaplasia also increased the chance of occurrence of dysplasia and cancer. Younger infection, after the greater the likelihood of the occurrence of gastric.