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Which bacterium is the primary cause of most peptic (gast... | QuestionStock

Representative image for question: Which bacterium is the primary cause of most peptic (gastric and duodenal) ulcers?

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Medicine

Which bacterium is the primary cause of most peptic (gastric and duodenal) ulcers?

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Which bacterium is the primary cause of most peptic (gastric and duodenal) ulcers?

Options:

Helicobacter pylori
Escherichia coli
Staphylococcus aureus
Clostridioides difficile

Correct answer: Helicobacter pylori

Explanation: Helicobacter pylori is the main cause of peptic ulcers; it was first cultured by Barry Marshall and Robin Warren in 1982 and leads to chronic gastritis and mucosal ulceration.

Created 2026-03-10T17:34:40.824Z. Updated 2026-03-10T17:34:40.824Z.