Researchers aren’t sure how H. pylori is transmitted, but it could be spread through unclean water and food, or through contact with infected bodily fluids such as saliva. It’s also unclear why some people develop symptoms, while others don’t.[1]
What causes H. pylori infection?
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•Last Updated: May 16, 2025
H. pylori infection may be transmitted through unclean water and food or through contact with infected bodily fluids like saliva.