In gastroenterology, patients are often asked to be tested for H. pylori because of its association with many digestive disorders. The diseases that have been clearly associated are acute and chronic gastritis, duodenal bulb ulcers, gastric ulcers, reflux esophagitis, functional dyspepsia, and gastric cancer. According to statistics, about 67%-80% of gastric ulcers and 95% of duodenal ulcers are caused by H. pylori. Its infection is also closely related to the occurrence of gastric cancer and gastric mucosa-associated lymph-like tissue lymphoma. Close contact between people infected with HP and their families, shared meals, gatherings between kindergarten children and students and eating unclean food from roadside stalls can lead to infection. Experts emphasize that, “At present, most families in China practice a communal meal system, and sharing dishes with family members is highly likely to lead to cross-infection of HP.” “In addition, kissing may also lead to infection.” If one person is infected with HP, 80 percent of the family will be infected.