Which among the following vaccines is stored in the freezer compartment?

AIIMS Delhi NO-2016

Pharmacology

Easy

Appeared in: AIIMS Delhi NO-2016

Explanation

The Measles vaccine is a live, attenuated vaccine supplied in a lyophilized (freeze-dried) form.
Live vaccines are generally very sensitive to heat, and their potency diminishes quickly upon heat exposure.
To preserve its effectiveness, the Measles vaccine must be stored in the freezer compartment at a temperature between -15°C and -25°C at higher storage levels, or in the coldest part of an Ice Lined Refrigerator (ILR) at the health center level.
Other vaccines that require freezer storage include Oral Polio Vaccine (OPV), Yellow Fever, and Rotavirus.

Option A: Tetanus Toxoid (TT) is a freeze-sensitive vaccine. It contains an aluminum salt adjuvant which gets damaged if frozen, leading to a loss of potency and an increased risk of sterile abscess at the injection site.
Option B: Like TT, the DPT (Diphtheria, Pertussis, Tetanus) vaccine is also freeze-sensitive. Freezing causes the components to clump together, destroying the vaccine's effectiveness.
Option D: The injectable Typhoid vaccine (Vi polysaccharide vaccine) is sensitive to freezing and should not be stored in the freezer.

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 is a critical nursing responsibility to ensure the National Immunization Programme's success. Administering a vaccine that has lost its potency due to improper storage provides no protection to the patient.
Nurses must know how to perform a 'Shake Test' to check if freeze-sensitive vaccines like DPT, TT, or Hepatitis B have been accidentally frozen. A damaged vaccine will show rapid sedimentation after shaking and must be discarded.
Administering a vaccine damaged by freezing not only fails to protect against disease but can also cause severe local reactions or sterile abscesses due to the aggregation of the aluminum adjuvant.

How to Approach the Question

First, identify the core of the question, which is about the specific storage temperature requirements for different vaccines, particularly which one needs freezer storage.
Recall the two main categories of vaccines based on temperature sensitivity: heat-sensitive (live vaccines) and freeze-sensitive (adjuvanted/inactivated vaccines).
Analyze each option: Classify TT, DPT, Measles, and Typhoid into one of these categories.
TT and DPT are toxoid vaccines containing an adjuvant, making them freeze-sensitive.
Typhoid (injectable) is also stored in the refrigerator and is freeze-sensitive.
Measles is a live, freeze-dried vaccine, making it highly heat-sensitive and requiring storage in the coldest available location, which is the freezer.

Concept Tested & Keywords

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