The technique of administering BCG vaccine is?

WCL Staff Nurse - 2019

Nursing Foundations (E5)

Easy

Appeared in: WCL Staff Nurse - 2019

Explanation

The BCG vaccine is a live attenuated bacterial vaccine that must be administered via the intra-dermal route.
This technique involves injecting a small dose (0.1 mL or 0.05 mL for neonates) into the dermis, creating a small, raised wheal.
The intra-dermal route ensures a localized inflammatory response, which is essential for the development of cell-mediated immunity against tuberculosis.
A successful vaccination is typically confirmed by the appearance of a papule that evolves into a small ulcer and finally a permanent scar over several weeks.
This specific route minimizes systemic side effects and prevents local complications like abscesses that can occur with incorrect (e.g., subcutaneous) administration.

Option A: Z-track is an intramuscular (IM) injection technique, not an intra-dermal one. It is designed to seal medication deep within the muscle and prevent leakage into subcutaneous tissue.
Option B: Intravenous injection delivers substances directly into the bloodstream for rapid, systemic effects. Live vaccines like BCG are never administered intravenously due to the risk of disseminated infection.
Option C: Subcutaneous injection deposits the substance into the fatty tissue layer beneath the dermis. Administering BCG this way is incorrect and can lead to adverse reactions like abscess formation, excessive ulceration, and regional lymphadenitis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Administration technique for BCG vaccine as background academic context rather than a clinical decision trigger.
Correct administration of the BCG vaccine is a critical nursing skill to ensure patient safety and vaccine efficacy.
The formation of the characteristic scar is a key indicator of a successful immune response and is often checked as a proxy for vaccination history.
Nurses must educate parents/patients about the normal local reaction (papule, ulcer, scar) to prevent anxiety and unnecessary interventions.

How to Approach the Question

First, identify the key subject of the question, which is the 'BCG vaccine'.
This is a factual recall question that tests your knowledge of standard immunization procedures.
Recall the specific and unique administration route for the BCG vaccine. Unlike many other vaccines, BCG has a very specific requirement.
Evaluate the given options, which represent different parenteral routes of administration (Z-track IM, IV, SC, ID).
Differentiate the intra-dermal route from the others. Remember that intra-dermal means 'into the dermis' and is characterized by the formation of a wheal.
Select the option that matches the standard protocol for BCG administration.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 42-44

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 192-194