Helicobacter pylori is contagious. H. pylori is a Gram-negative bacterium that exists in the mucosa of the human stomach and is contagious. There are various ways of transmission, mainly through close contact between people, and the susceptibility of the infected person, the resistance of the body, but also with irregular diet, skipping breakfast, overeating and other dietary structure. The infection is also inevitably linked to the living and eating habits of close contacts. 1, fecal – oral route of transmission: H. pylori settled in the human stomach, H. pylori will be shed with the gastric mucosa, and through the fecal discharge contaminated food and water, through the fecal – oral route of transmission of infection. 2, oral-oral route of transmission: H. pylori can be hidden in the dental plaque, such as cross-use of utensils during meals, the spread of germs through saliva and other routes. 3, gastric – oral route of transmission: H. pylori bacteria exist in the gastric juice, and when the carrier of H. pylori vomiting, the bacteria will be transmitted to healthy people with the vomit. Especially the transmission of acute infection period, often from the vomit to others. 4, medical transmission: many places there is the possibility of medical transmission of H. pylori. Gastroscopy is an important way to cause H. pylori infection. When patients undergo gastroscopy, H. pylori may be attached to the gastroscopy instrument, and if the instrument is not thoroughly cleaned, it is likely to become a source of infection of H. pylori. 5, animal-derived transmission: H. pylori is likely to be infectious to humans and certain species of animals, and people may be infected through close contact with animals or through the consumption of food of animal origin. In short, H. pylori can be transmitted to others through a variety of ways, find ways to cut off the transmission is an effective measure to reduce transmission.