Immunisation: catch-up immunisation principle: practice question

A Pediatrics 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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Pediatrics · Immunisation: catch-up immunisation principle

Sample item

A 10-month-old received two doses of pentavalent vaccine at 6 and 10 weeks and then defaulted. What is the correct approach for the remaining doses?

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

The answer and the reasoning

D. Give the third dose now without restarting the series

In catch-up immunisation the series is never restarted and minimum intervals are respected. The missed dose is simply given, regardless of the time elapsed.

Option by option

  • A. Skip the third dose permanently

    Skipping the dose leaves incomplete protection.

  • B. Restart the primary series from dose one

    Restarting is unnecessary and not recommended.

  • C. Give four extra doses

    Extra doses do not improve protection and waste vaccine.

  • D. Give the third dose now without restarting the series (correct)

    Correct. Doses already given count.

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.

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Questions about this Pediatrics question

What is the answer to this Pediatrics question?

The best answer is D, Give the third dose now without restarting the series. In catch-up immunisation the series is never restarted and minimum intervals are respected.

Why is "Skip the third dose permanently" not the answer?

Skipping the dose leaves incomplete protection.

Why is "Restart the primary series from dose one" not the answer?

Restarting is unnecessary and not recommended.

Why is "Give four extra doses" not the answer?

Extra doses do not improve protection and waste vaccine.

What concept does this question test?

It tests Immunisation: catch-up immunisation principle in Pediatrics. The missed dose is simply given, regardless of the time elapsed.

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 Immunisation: catch-up immunisation principle?

Memorise milestones and the vaccine schedule as tables and revise them often. Then use the flashcards and the other Pediatrics 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.