Hello!!
Population with blood group "O" is more prone to peptic ulcer because there was increased binding of Helicobacter pylori to the epithelial cells. It was concluded that denser colonization of epithelial cells and increased inflammatory reactions as a result of bacterial binding in group O people might be one reason that this population is more prone.
Thanks

Dear Aspirant,
Blood group A is associated with high risk of gastric ulcers not peptic ulcer.
Blood group O people are actually associated with high risk of peptic ulcer.
Comment if any queries.
Hope this helps
Good luck

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