Communicable diseases: deep freezer storage: 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 · Communicable diseases: deep freezer storage

Sample item

Which vaccine is stored in the deep freezer at -15 to -25 degrees Celsius at district and state stores?

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

The answer and the reasoning

C. Oral polio vaccine

OPV is heat-sensitive and remains stable for longer when frozen, so it is kept in the deep freezer. Pentavalent, hepatitis B and Td vaccines are freeze-sensitive and must never be frozen.

Option by option

  • A. Td vaccine

    Td vaccine, an adsorbed toxoid, is damaged by freezing.

  • B. Hepatitis B vaccine

    Hepatitis B vaccine is damaged by freezing.

  • C. Oral polio vaccine (correct)

    Correct. OPV is stored in the freezer.

  • D. Pentavalent vaccine

    Pentavalent vaccine is damaged by freezing.

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 PSM question

What is the answer to this PSM question?

The best answer is C, Oral polio vaccine. OPV is heat-sensitive and remains stable for longer when frozen, so it is kept in the deep freezer.

Why is "Td vaccine" not the answer?

Td vaccine, an adsorbed toxoid, is damaged by freezing.

Why is "Hepatitis B vaccine" not the answer?

Hepatitis B vaccine is damaged by freezing.

Why is "Pentavalent vaccine" not the answer?

Pentavalent vaccine is damaged by freezing.

What concept does this question test?

It tests Communicable diseases: deep freezer storage in PSM. Pentavalent, hepatitis B and Td vaccines are freeze-sensitive and must never be frozen.

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 Communicable diseases: deep freezer storage?

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.