•O positive is the most common blood type.
•The most common cause of Peptic Ulcer is infection of the stomach by bacteria called Helicobacter pylori (H.pylori).
•Helicobacter pylori is known to bind to the O blood-group structure (a particular series of sugars) present on gastric epithelial cells (a person who is O-positive is about twice as likely to develop stomach ulcers relative to O-negative persons
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