Micro & Immunology · single question
A patient has a peptic ulcer. Which microorganism is most responsible for peptic ulcer disease?
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Correct answer: C. Helicobacter pylori
- A. Candida albicans is a fungus that causes oral/esophageal candidiasis, not peptic ulcers.
- B. E. coli causes urinary/GI infections, not peptic ulcers.
- C. Correct. Helicobacter pylori, a gram-negative spiral bacterium, is the leading cause of peptic (gastric/duodenal) ulcers; the other major cause is chronic NSAID use.
- D. S. mutans is the principal cariogenic oral bacterium — unrelated to gastric ulcers.
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