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 immunity in a vaccinated community?

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

The answer and the reasoning

A. Indirect protection when transmission is reduced by sufficient immunity

Herd immunity occurs when enough people are immune that transmission chains are disrupted, indirectly protecting some susceptible individuals.

Option by option

  • A. Indirect protection when transmission is reduced by sufficient immunity (correct)

    Correct: reduced transmission provides indirect community protection.

  • B. A vaccine reaction affecting all recipients

    Vaccine reactions are not herd immunity.

  • C. A method of diagnosing immunodeficiency

    Herd immunity is not a diagnostic test.

  • D. Immunity gained only after natural infection

    Natural infection is not the only route to population 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 PSM questions

Questions about this PSM question

What is the answer to this PSM question?

The best answer is A, Indirect protection when transmission is reduced by sufficient immunity. Herd immunity occurs when enough people are immune that transmission chains are disrupted, indirectly protecting some susceptible individuals.

Why is "A vaccine reaction affecting all recipients" not the answer?

Vaccine reactions are not herd immunity.

Why is "A method of diagnosing immunodeficiency" not the answer?

Herd immunity is not a diagnostic test.

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

Natural infection is not the only route to population immunity.

What concept does this question test?

It tests Immunization in PSM. The correct option holds because: Correct: reduced transmission provides indirect community protection.

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.