Which vaccine should be stored in the freezer compartment of the refrigerator?

NORCET 2 -2021 (Shift-2)

Community Health Nursing

Easy

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

Explanation

The Measles vaccine is a live-attenuated, freeze-dried vaccine, which makes it extremely sensitive to heat.
To maintain its potency and ensure it provides immunity, it must be stored in the freezer compartment at a temperature range of -15°C to -25°C.
Exposure to higher temperatures, even for a short period, can render the vaccine ineffective.
Among the given options, only the Measles vaccine requires freezer storage as per the Universal Immunization Programme (UIP) guidelines.

Option A: The DPT vaccine is freeze-sensitive. Freezing destroys the potency of the pertussis component and can cause the diphtheria and tetanus toxoids to clump with the adjuvant, leading to increased local reactions and loss of effectiveness.
Option B: The Hepatitis B vaccine is also freeze-sensitive. The aluminum adjuvant in the vaccine is irreversibly damaged by freezing, which makes the vaccine ineffective.
Option D: The BCG vaccine is a live, freeze-dried vaccine that is sensitive to both heat and light. However, its recommended storage temperature is in the refrigerator at +2°C to +8°C, not the freezer.

Visual 1: Diagram: An Ice-Lined Refrigerator (ILR) showing the correct placement of different vaccines. Heat-sensitive vaccines (like Measles, OPV) are in the top basket/freezer, while freeze-sensitive vaccines (like DPT, Hep B) are in the lower baskets.
Visual 2: Chart: A table summarizing the storage temperatures, sensitivities (heat/freeze/light), and types of vaccines under the Universal Immunization Programme (UIP).

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 to ensure vaccine efficacy.
Nurses must regularly monitor and document refrigerator and freezer temperatures (twice daily) to prevent vaccine wastage and protect patient health.
What if? If a freeze-sensitive vaccine like DPT is suspected of being frozen, a 'shake test' must be performed. If the vial fails the test (sediment forms quickly), it must be discarded as it has lost potency.

How to Approach the Question

First, identify the core of the question: which vaccine requires freezer storage.
Recall the two main categories of vaccine sensitivity: heat-sensitive and freeze-sensitive.
Remember the general rule: live attenuated vaccines (like Measles, OPV) are typically heat-sensitive and may require freezing.
Conversely, inactivated, toxoid, or subunit vaccines (like DPT, Hep B, TT) are often freeze-sensitive and must NOT be frozen.
Evaluate each option based on this rule: DPT and Hepatitis B are freeze-sensitive. BCG, while live, is stored in the refrigerator. Measles is a live vaccine that is highly heat-sensitive and requires freezer storage.
Conclude that Measles is the correct answer.

Concept Tested & Keywords

QCTfndWQHm8PWjl6M36jDY