Physiology & Biochemistry · single question
Which organism causes pseudomembranous colitis (often after antibiotic use)?
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Correct answer: A. Clostridioides (Clostridium) difficile
- A. Correct. C. difficile overgrowth after antibiotics causes pseudomembranous colitis; treat with oral vancomycin or fidaxomicin (metronidazole as an alternative).
- B. E. coli causes other GI/urinary infections, not classic pseudomembranous colitis.
- C. H. pylori causes peptic ulcers/gastritis.
- D. Salmonella typhi causes typhoid fever.
Note: Current guidance favors oral vancomycin/fidaxomicin first-line; metronidazole is now an alternative.
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