: Can Helicobacter pylori be transmitted through saliva? I was wondering if you can get Helicobacter pylori (the bacteria that can cause gastritis and ulcers) by kissing a person, if that person is infected with it?

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The mode of transmission of helicobacter is unknown but studies show that people with helicobacter infections may have it also in their saliva. So, in this study, 75% had helicobacter identified by molecular Probes.
www.ncbi.nlm.nih.gov/pmc/articles/PMC502720/
This has lead to some people saying that transmission by saliva is common.
publichealth.arizona.edu/outreach/health-literacy-awareness/hpylori/transmission