How many times H. pylori will be infected after contact is a matter of probability. Some patients may be infected after one contact due to poorer resistance, while some with stronger resistance may be infected after many contacts. Helicobacter pylori is mainly transmitted by fecal-oral and oral-oral methods, and the exact number of contacts may be infected, which needs to be decided according to the patient’s resistance. Some patients with lower resistance may become infected after sharing utensils or kissing with someone infected with H. pylori. People with stronger resistance may need multiple contacts with H. pylori patients to be infected, and there is no fixed data on this. H. pylori is more contagious, so be prepared to cut off the source of infection.