Helicobacter pylori (Hp) infection is a major causative factor in chronic active gastritis, peptic ulcer, gastric mucosa-associated lymphoma and gastric cancer. 1994, the World Health Organization’s International Agency for Research on Cancer designated H. pylori as a class I carcinogen. In China, it has an infection rate of about 56%, and about 1% of those infected will eventually develop gastric cancer. Since it is the culprit of gastric cancer, prevention and eradication of H. pylori is the first key to prevent gastric cancer. So what are the ways of transmission of H. pylori? Above: The proportion of each age group of HP infection in China H. pylori is highly contagious and can be transmitted through mouth, fecal and gastric mouths. Above: The main ways of HP transmission I. Oral-oral transmission Oral-oral transmission is the most important way of transmission of H. pylori infection. 1, H. pylori can grow and reproduce on dental plaque and dental caries, so brush your teeth this thing must be taken seriously, do not do hastily. 2, common meals is one of the important ways of H. pylori infection, so it is recommended that dishes and kitchenware are regularly disinfected, it is best to use public chopsticks, and reduce the opportunity to eat out. 2, undercooked food: steak seven minutes cooked or even three minutes cooked, eat hot pot when the meat just put in the pot, it has long been impatient, these may have a safety risk of infection with H. pylori. 3, often eat out the chance of being infected also increased significantly, because in the field dishes, kitchenware, water, ingredients, etc. have the possibility of being contaminated. 4, irritating food because of irritating food easily stimulate the gastric mucosa, resulting in the stomach’s body resistance is low, which can easily lead to the invasion of H. pylori, it is not immediate infection hp, but is subtle and lasting. 5, another important way is kissing, scientific research has found: the stomach of H. pylori in the saliva will also have residual. And kissing is the most direct way to exchange saliva. So can not kiss? Young people are the first to say no. You may wish to brush your teeth before kissing, and if one party is already infected, then wait for ta eradication before making out. Second, fecal – oral transmission: feces survived H. pylori contaminated water or food, and make the drinker or eaters infected with H. pylori, research shows that low temperature can prolong the survival period of H. pylori, so low temperature preservation of food such as H. pylori contamination will increase the chances of transmission of H. pylori. Therefore, it is very important to wash your hands before and after meals, and keep clean water, etc. Insist on not drinking raw water and not eating raw vegetables or unwashed fruits and vegetables. Third, gastric-oral transmission: refers to the transmission of H. pylori to healthy people through the vomit of infected people. It mainly occurs in nurseries, kindergartens or among siblings of children. Because children are prone to vomiting and physiological gastroesophageal reflux, as well as saliva, snot, stool, etc., which may carry bacteria. Also, children have poor hygiene awareness and have a tendency to suck their fingers, so H. pylori is easily spread among children living in groups. Chinese people are not used to eating with chopsticks, and they also like to gather in piles, a plate of food to clip around, which provides favorable conditions for the invasion of H. pylori; once there is an infected person at the table, then the others are likely to be infected; so, since you can not change your eating habits, reduce the chances of gathering. Likewise, just one member of the same family infected with H. pylori is likely to infect the whole family. Studies have found that residential density and infection rates are closely related, and close contact increases the chance of transmission. Most infections in family members belong to the same Hp subgroup. Therefore, if one of the family members is infected, in addition to their own attention to food and life isolation, it is also recommended that others go for testing and follow medical advice to decide whether to eradicate. V. Mother-to-child transmission Includes unclean breastfeeding, mouth-to-mouth feeding, feeding after chewing, kissing the baby’s mouth and lips, or feeding with adults’ utensils, straws, etc. Sixth, transmitted by pets, flies, insects After contact with pets, remember to wash your hands, and live in a clean environment to avoid mosquito and fly harassment. Medical transmission Invasive examinations such as gastroscopy, laryngoscopy, oral, dental and nasal treatment are the main causes of medical infections. So the examination and medical treatment must go to the regular hospital.