Immunization: practice question

A PSM 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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PSM · Immunization

Sample item

What is herd protection in an immunization program?

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

The answer and the reasoning

A. Reduced transmission that indirectly protects susceptible people

When enough people are immune, transmission chains are interrupted and susceptible individuals gain indirect protection; the threshold depends on vaccine effectiveness, mixing patterns, and the infection's transmissibility.

Option by option

  • A. Reduced transmission that indirectly protects susceptible people (correct)

    Correct: population immunity can reduce exposure for those not immune.

  • B. Storage of vaccines in large animal herds

    The term does not refer to animal vaccine storage.

  • C. Immunity obtained only after natural infection

    Natural infection is not the definition of herd protection.

  • D. A guarantee that every vaccinated person responds

    No vaccine guarantees response in every individual.

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 PSM questions

Questions about this PSM question

What is the answer to this PSM question?

The best answer is A, Reduced transmission that indirectly protects susceptible people. When enough people are immune, transmission chains are interrupted and susceptible individuals gain indirect protection; the threshold depends on vaccine effectiveness, mixing patterns, and the infection's transmissibility.

Why is "Storage of vaccines in large animal herds" not the answer?

The term does not refer to animal vaccine storage.

Why is "Immunity obtained only after natural infection" not the answer?

Natural infection is not the definition of herd protection.

Why is "A guarantee that every vaccinated person responds" not the answer?

No vaccine guarantees response in every individual.

What concept does this question test?

It tests Immunization in PSM. The correct option holds because: Correct: population immunity can reduce exposure for those not immune.

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 Immunization?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM 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.