Bacteriology: practice question

A Microbiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Microbiology · Bacteriology

Sample item

Which organism is classically associated with pseudomembranous colitis after antibiotics?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

C. Clostridioides difficile

C. difficile can overgrow after antibiotics disrupt flora and produces toxins that cause watery diarrhoea and pseudomembranous colitis.

Option by option

  • A. Vibrio cholerae

    Vibrio causes secretory diarrhoea.

  • B. Campylobacter jejuni

    Campylobacter causes inflammatory gastroenteritis.

  • C. Clostridioides difficile (correct)

    Correct: antibiotic-associated toxin colitis suggests C. difficile.

  • D. Helicobacter pylori

    H. pylori colonizes gastric mucosa.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

More Microbiology questions

Questions about this Microbiology question

What is the answer to this Microbiology question?

The best answer is C, Clostridioides difficile. C.

Why is "Vibrio cholerae" not the answer?

Vibrio causes secretory diarrhoea.

Why is "Campylobacter jejuni" not the answer?

Campylobacter causes inflammatory gastroenteritis.

Why is "Helicobacter pylori" not the answer?

H. pylori colonizes gastric mucosa.

What concept does this question test?

It tests Bacteriology in Microbiology. difficile can overgrow after antibiotics disrupt flora and produces toxins that cause watery diarrhoea and pseudomembranous colitis.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Bacteriology?

Make a one-line identity card for each organism: shape and stain, defining test, toxin, disease and drug. Then use the flashcards and the other Microbiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.