Name of the thesis: Study of epidemiological characteristics of Helicobacter pylori infection in children and the household members of two minority ethnics (Thai and Khmer) Students name: Nguyen Thi Anh Xuan Specialty: Pediatrics Registered code: 62720135 MAJOR EXTRACT CONTENT The bacterium Helicobacter pylori (H pylori) is one of three microbial agents causing preventable cancer, the main cause of gastro-duodenal ulcers.