& x20;Ideal temperature range for storage of DPT vaccine is: - AIIMS M.Sc. Nsg Entrance exam-2026

AIIMS M.Sc. Nsg Entrance exam-2026

Community Health Nursing

Easy

Appeared in: AIIMS M.Sc. Nsg Entrance exam-2026

Explanation

The officially recommended storage temperature for most vaccines, including the freeze-sensitive DPT vaccine, is between +2°C and +8°C.
The option 4–8°C falls squarely within this recommended range and is considered the safest practical choice among the alternatives.
This range provides a crucial safety buffer, minimizing the risk of the temperature dropping below the 2°C minimum, which could lead to accidental freezing and irreversible damage to the vaccine.

Option A: This range (2–4°C) is too narrow and close to the freezing point. While technically within the 2-8°C guideline, it offers a very small margin for error, increasing the risk of accidental freezing due to minor temperature fluctuations in the refrigerator.
Option C: 2°C is a single temperature point, not a range. It represents the absolute minimum allowable temperature. Storing vaccines at this exact point is risky as any slight malfunction could cause the temperature to drop below freezing.
Option D: Temperatures below 2°C, and especially at or below 0°C, are damaging to freeze-sensitive vaccines like DPT. Freezing destroys the vaccine's potency and can cause harmful side effects like sterile abscesses if administered.

Visual 1: Infographic: A diagram showing the correct placement of different vaccines inside an ice-lined refrigerator (ILR). Freeze-sensitive vaccines (like DPT, Hep B, TT) should be in the upper baskets, while heat-sensitive/freeze-tolerant vaccines (like OPV, Measles) can be placed lower down, away from the freezer compartment.
Visual 2: Chart: A chart categorizing common vaccines based on their sensitivity (Heat-sensitive vs. Freeze-sensitive) with their ideal storage temperatures.
Visual 3: Illustration: An image of the 'Shake Test' used to check if a freeze-sensitive vaccine like DPT has been accidentally frozen. It compares a suspected vial with a control vial that was deliberately frozen and thawed.

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 in an immunization clinic is to ensure the maintenance of the cold chain. This includes checking and recording the refrigerator temperature twice daily.
Nurses must know which vaccines are freeze-sensitive (e.g., DPT, Pentavalent, TT, Hep B) and which are heat-sensitive (e.g., OPV, Measles, BCG) to store them correctly within the refrigerator.
What if? If a nurse finds the refrigerator temperature is 1°C, they must immediately quarantine the freeze-sensitive vaccines, label them 'Do Not Use', and report it to the supervisor. A 'shake test' may be required to assess the damage before deciding to discard the vaccines. This prevents administration of ineffective or harmful vaccines.

How to Approach the Question

First, identify the core of the question: it's asking for a specific numerical value – the storage temperature for the DPT vaccine.
Recognize that DPT is a common vaccine in the national immunization schedule and its storage requirements are a critical piece of factual knowledge for nurses.
Recall the general principle of the 'cold chain', which is maintaining vaccines between +2°C and +8°C.
Evaluate the given options against this principle. Eliminate options that are clearly wrong, such as a single temperature point (2°C) or a range that includes freezing temperatures (<2°C).
Between the two remaining plausible ranges (2–4°C and 4–8°C), apply clinical safety principles. The range 4–8°C provides a better safety margin against accidental freezing, making it the 'most ideal' or 'best' choice in a practical setting.

Concept Tested & Keywords

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