What is the route of BCG vaccine administration?

AIIMS Rishikesh NO - 2019

Nursing Foundation

Easy

Appeared in: AIIMS Rishikesh NO - 2019

Explanation

The Bacillus Calmette-Guérin (BCG) vaccine is specifically designed for intradermal administration, meaning it is injected into the topmost layer of the skin (the dermis).
This route is chosen to induce a benign, artificial primary infection that stimulates acquired resistance to tuberculosis.
The standard procedure involves injecting 0.1 ml (0.05 ml for newborns) into the skin over the left deltoid muscle, which should produce a characteristic wheal (a small, raised blister).
This method ensures slow absorption and a localized immune response, which is critical for the vaccine's effectiveness and is confirmed by the eventual formation of a small, permanent scar.

Option B: A subcutaneous injection delivers the vaccine into the fatty tissue beneath the skin. For BCG, this is an incorrect technique and increases the risk of adverse reactions, such as local abscess formation and enlarged lymph nodes.
Option C: Intravenous administration involves injecting directly into a vein, providing immediate access to the bloodstream. Vaccines are not administered this way as it would cause rapid systemic distribution and bypass the necessary local immune response, potentially leading to severe adverse effects.
Option D: An intramuscular injection delivers the vaccine deep into the muscle tissue. While this is a very common route for many vaccines, it is not the correct route for BCG.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Route of administration for BCG vaccine as background academic context rather than a clinical decision trigger.
Correct administration of the BCG vaccine is a critical nursing skill. Using the intradermal route is essential not only for the vaccine's efficacy in preventing severe forms of tuberculosis in children but also for patient safety.
The characteristic scar left by the BCG vaccine is often used as a marker for vaccination history in clinical and public health settings.
What if the injection is given too deep (subcutaneously)? The risk of a local abscess and suppurative lymphadenitis (inflammation of lymph nodes with pus) increases significantly, causing unnecessary discomfort and complications for the infant.

How to Approach the Question

First, identify the core of the question, which is asking for the specific administration route of the BCG vaccine.
Recall the standard immunization schedule and the routes for common vaccines. Note that some vaccines have unique administration requirements.
Differentiate between the common parenteral routes: Intradermal (into the skin), Subcutaneous (into fat), and Intramuscular (into muscle).
Remember that BCG is unique among vaccines in its requirement for an intradermal injection.
Eliminate the other options by associating them with other common vaccines (e.g., IM for DPT, SC for MMR).
Select 'Intradermal' as the specific and correct route for BCG.

Concept Tested & Keywords

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