DPT and DT vaccine should be stored between?

KPSC Staff Nurse - 2017

Pharmacology

Easy

Appeared in: KPSC Staff Nurse - 2017

Explanation

DPT and DT vaccines must be stored within the standard cold chain temperature range of +2°C to +8°C to maintain their potency.
This specific range is critical because these are freeze-sensitive vaccines. Temperatures below +2°C can cause irreversible damage due to freezing.
Simultaneously, temperatures above +8°C can degrade the vaccine through heat exposure, rendering it ineffective.
The 2-8°C range ensures the vaccine is protected from both heat degradation and damage from freezing.

Option A: This range is incomplete. While storing vaccines between 4°C and 8°C is safe, it excludes the lower acceptable limit of 2°C. The official guideline includes the full 2-8°C range.
Option B: This range is too narrow. While 4-6°C is an ideal target to keep vaccines safely away from the 2°C and 8°C boundaries, it does not represent the full officially accepted storage range.
Option D: The upper limit of 10°C is too high and exceeds the maximum recommended temperature of 8°C. Exposure to temperatures above 8°C can lead to a rapid loss of vaccine potency.

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 for DPT and DT as background academic context rather than a clinical decision trigger.
Maintaining the cold chain is a fundamental nursing responsibility in immunization. Failure to do so results in vaccine wastage and, more importantly, administration of non-potent vaccines, leading to vaccine-preventable diseases.
Nurses must meticulously monitor and document refrigerator temperatures at least twice daily to ensure the cold chain is not broken.
A 'shake test' is a simple, crucial procedure a nurse must know. It is used to determine if an adsorbed (freeze-sensitive) vaccine like DPT has been accidentally frozen. If the vial fails the test, it must be discarded.

How to Approach the Question

First, identify the keywords in the question: 'DPT', 'DT vaccine', and 'stored'. This points to a question about vaccine storage.
Recognize this as a factual recall question based on standard immunization protocols.
Recall the concept of the 'cold chain', which is the system for storing and transporting vaccines at recommended temperatures.
Access your knowledge base for the specific temperature range of the vaccine cold chain. The standard range for most liquid vaccines is +2°C to +8°C.
Compare this standard range with the given options. Option C, '2-8 degree Celsius', is an exact match.
Eliminate other options by reasoning: 4-8°C is incomplete, 4-6°C is too narrow, and 4-10°C exceeds the safe upper limit.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 166-168

E6 Ghai Essential Pediatrics(pp 26-904 of 913) pp. 214-216, 213-215