Vaccines: 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 · Vaccines

Sample item

Why are booster doses used for some vaccines?

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

The answer and the reasoning

D. Restore or strengthen waning immune protection

Booster doses reinforce immune memory or raise antibody levels when protection declines or exposure risk remains significant over time.

Option by option

  • A. Replace all public-health surveillance

    Surveillance remains important.

  • B. Eliminate need for cold chain

    Cold chain still matters.

  • C. Cause primary infection intentionally

    Vaccines do not intentionally cause disease.

  • D. Restore or strengthen waning immune protection (correct)

    Correct: boosters sustain protective immunity.

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 D, Restore or strengthen waning immune protection. Booster doses reinforce immune memory or raise antibody levels when protection declines or exposure risk remains significant over time.

Why is "Replace all public-health surveillance" not the answer?

Surveillance remains important.

Why is "Eliminate need for cold chain" not the answer?

Cold chain still matters.

Why is "Cause primary infection intentionally" not the answer?

Vaccines do not intentionally cause disease.

What concept does this question test?

It tests Vaccines in Microbiology. The correct option holds because: Correct: boosters sustain protective immunity.

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 Vaccines?

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.