Which of the following vaccine is kept in freezer compartment in refrigerator?

NORCET 3 - 2022 (Shift-2)

Pharmacology

Easy

Appeared in: NORCET 3 - 2022 (Shift-2)

Explanation

The Measles vaccine is a live, lyophilized (freeze-dried) vaccine, making it very sensitive to heat.
However, it is stable at freezing temperatures and is not damaged by being frozen.
For long-term storage at health centers, it is kept in the freezer compartment at a temperature between -15°C and -25°C to preserve its potency.
Other vaccines that can be stored in the freezer include Oral Polio Vaccine (OPV) and Yellow Fever vaccine.

Option A: Tetanus Toxoid (T.T) is a freeze-sensitive vaccine. Freezing destroys its potency as it contains an aluminum adjuvant that is damaged by low temperatures.
Option C: The DPT vaccine is also freeze-sensitive. It is an adsorbed vaccine, and freezing causes irreversible damage, leading to loss of effectiveness.
Option D: Hepatitis B vaccine is highly sensitive to freezing. The freezing process damages the vaccine's structure and adjuvant, rendering it ineffective.

Visual 1: Diagram - An illustration of an ice-lined refrigerator (ILR) showing the correct placement of different vaccines. Freeze-stable vaccines (like Measles, OPV) are in the top basket/freezer, while freeze-sensitive vaccines (DPT, TT, Hep B) and diluents are in lower baskets, away from the frozen ice packs.
Visual 2: Infographic - A chart comparing heat-sensitive vs. freeze-sensitive vaccines, with clear icons and temperature ranges for each category.
Visual 3: Photo - A picture demonstrating the 'Shake Test' to check if a freeze-sensitive vaccine has been accidentally frozen. It shows a 'control' (intentionally frozen and thawed) vial with sediment and a 'test' vial with a uniform cloudy appearance.

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.
Maintaining the 'cold chain'—the system of storing and transporting vaccines at recommended temperatures—is a critical nursing responsibility. A break in the cold chain can lead to vaccine failure and leave patients unprotected.
Nurses must perform and document temperature checks of vaccine refrigerators at least twice daily to ensure they are within the safe range (+2°C to +8°C for the main compartment).
If a freeze-sensitive vaccine is suspected to have been frozen, the nurse must perform the 'Shake Test' before use. If the test fails, the vaccine must be discarded as per protocol.

How to Approach the Question

First, identify the core of the question, which is about the specific temperature storage requirements for different types of vaccines.
Recall the two main categories of vaccine sensitivity: heat-sensitive (but freeze-stable) and freeze-sensitive.
Associate live, lyophilized (powder) vaccines like Measles, OPV, and BCG with the heat-sensitive/freeze-stable category. These can be frozen.
Associate toxoids and adsorbed vaccines like DPT, T.T, and Hepatitis B with the freeze-sensitive category. These must NOT be frozen.
Evaluate each option based on this classification. T.T, DPT, and Hepatitis B are all freeze-sensitive.
Conclude that Measles is the only vaccine among the options that can be safely stored in a freezer.

Concept Tested & Keywords

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