Which vaccine should be stored in freezer compartment of the refrigerator? & x20; - NORCET 2 -2021 (Shift-2)

NORCET 2 -2021 (Shift-2)

Community Health Nursing

Easy

Appeared in: NORCET 2 -2021 (Shift-2)

Explanation

Measles vaccine is a live, lyophilized (freeze-dried) vaccine, making it highly sensitive to heat.
To preserve its potency, it must be stored in the coldest available environment, which is the freezer compartment of a refrigerator or a deep freezer (-15°C to -25°C).
Unlike other vaccine types, live attenuated vaccines like Measles are not damaged by freezing.

Option A: DPT is a freeze-sensitive vaccine. It contains an aluminum adjuvant that is irreversibly damaged by freezing, which destroys the vaccine's effectiveness.
Option B: Hepatitis B vaccine is also freeze-sensitive. Freezing destroys the vaccine's structure and potency.
Option D: BCG is a live vaccine, but it is primarily known for its sensitivity to light. Standard protocol is to store it in the main refrigerator compartment (+2°C to +8°C), not the freezer.

Visual 1: Diagram - An illustration of an Ice Lined Refrigerator (ILR) showing the correct placement of different vaccines. Heat-sensitive vaccines (Measles, OPV) are in the bottom basket/freezer section, while freeze-sensitive vaccines (DPT, Hep B) are in the top baskets.
Visual 2: Chart - A temperature sensitivity chart for common vaccines, color-coding them from most heat-sensitive (requiring freezing) to most freeze-sensitive (requiring refrigeration).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vaccine storage and cold chain management as background academic context rather than a clinical decision trigger.
A nurse's primary responsibility is to ensure the integrity of the cold chain. Improper storage can lead to vaccine failure and leave patients unprotected.
Nurses must know how to perform a 'Shake Test' to check if freeze-sensitive vaccines like DPT or Hepatitis B have been accidentally frozen. A damaged vaccine will show rapid sedimentation after shaking.
Always check the Vaccine Vial Monitor (VVM) on heat-sensitive vaccines like Measles and OPV before administration. If the inner square is as dark as or darker than the outer circle, the vaccine has been exposed to excessive heat and must be discarded.

How to Approach the Question

First, identify the core of the question: It asks about vaccine storage in a 'freezer'.
Recall the two main categories of vaccine temperature sensitivity: heat-sensitive and freeze-sensitive.
Associate 'freezer' storage with the most heat-sensitive vaccines, which are typically live attenuated vaccines.
Evaluate the options: DPT and Hepatitis are killed/adjuvanted vaccines and are known to be freeze-sensitive.
BCG, while live, is primarily light-sensitive and stored in the refrigerator.
This leaves Measles, a well-known heat-sensitive live vaccine that requires freezer storage to maintain its potency. Select this as the correct answer.

Concept Tested & Keywords

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