NORCET -2 (shift-2): Which vaccine should be stored in the freezer compartment of the refrigerator?

NORCET -2 (shift-2)

Community Health Nursing

Easy

Appeared in: NORCET -2 (shift-2)

Explanation

Measles vaccine is a live attenuated viral vaccine, which makes it highly sensitive to heat and light.
To preserve its potency, the measles vaccine must be stored for the long term in a frozen state, typically at temperatures between -15°C and -25°C.
While it may be kept at refrigerator temperatures for short periods after being moved from central stores, its primary storage requirement is freezing.
Other vaccines that require freezer storage include Oral Polio Vaccine (OPV), Varicella, and Yellow Fever vaccine.

Option A: The DPT vaccine is freeze-sensitive. Freezing destroys the vaccine's potency and can cause an increased risk of local adverse reactions, such as sterile abscesses, due to the clumping of the aluminum adjuvant.
Option B: The Hepatitis B vaccine is also freeze-sensitive. Like the DPT vaccine, it contains an adjuvant that is damaged by freezing, rendering the vaccine ineffective.
Option D: The BCG vaccine is a live, freeze-dried vaccine, but it is stored in the refrigerator at +2°C to +8°C. It is also highly sensitive to light and must be protected from it.

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 and patient safety.
Administering a vaccine damaged by improper temperature (either heat or freezing) can result in primary vaccine failure, meaning the patient does not develop immunity and remains susceptible to the disease.
Nurses must perform and document temperature checks of vaccine refrigerators and freezers twice daily and know the emergency protocol for power failures or temperature excursions.

How to Approach the Question

First, identify the key term in the question: 'freezer compartment'. This indicates the question is about a vaccine that requires storage at sub-zero temperatures.
Next, recall the general principles of vaccine storage. Differentiate between heat-sensitive vaccines (often live viruses) and freeze-sensitive vaccines (often those with adjuvants).
Evaluate the options based on these principles. DPT and Hepatitis B are known to be freeze-sensitive and are damaged by freezing.
Consider the remaining options, Measles and BCG. Both are live attenuated vaccines.
Recall that Measles vaccine requires freezer storage for long-term viability, whereas BCG is stored in the refrigerator.
Conclude that Measles is the correct answer as it is the only option that should be stored in the freezer.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 103-105