Helicobacter pylori is not spread by hand-to-mouth transmission, and its main transmission routes are oral-oral transmission and fecal-oral transmission. 1. Oral-oral transmission: sharing utensils, mouth-to-mouth feeding, or intimate contact such as kissing with an infected person may be contagious. 2. Fecal-oral transmission: Infection may occur if hands are not washed promptly after defecation, or if raw water or food contaminated by feces or vomit of an infected person is consumed. In daily life, isolation measures should be taken. You should practice meal sharing and avoid sharing tableware with others; avoid drinking raw water or unclean food; wash your hands in time before and after meals, and avoid intimate contact such as mouth-to-mouth feeding. This can effectively prevent H. pylori infection. Once diagnosed with H. pylori infection, consult a doctor as soon as possible for examination and targeted treatment under the guidance of the doctor.