The route of administration of BCG vaccine is

Appeared in: NHM UP Staff Nurse-2021 Shift-2nd

Explanation

The Bacillus Calmette-Guérin (BCG) vaccine is specifically administered via the intradermal (ID) route.
This involves injecting the vaccine into the dermis, the layer of skin just below the epidermis, to ensure optimal immune response.
The standard procedure creates a characteristic wheal (a raised, whitish bleb) of about 5 mm at the injection site, confirming correct administration.
The preferred site is the insertion of the left deltoid muscle in the upper arm.
This route is chosen to maximize the local immune reaction, leading to the formation of a papule and eventually a permanent scar, which serves as evidence of vaccination.

Option A: The oral route is used for vaccines that are absorbed through the gastrointestinal tract. BCG is not effective when given orally.
Option C: Subcutaneous injection delivers the vaccine into the fatty tissue layer. If BCG is given this way, it can cause complications like local abscesses and enlarged lymph nodes, with a less effective immune response.
Option D: Intramuscular injection delivers the vaccine deep into the muscle tissue. This route is incorrect for BCG and does not produce the required localized immune reaction.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Vaccine Administration Routes as background academic context rather than a clinical decision trigger.
Correct administration technique is critical for the BCG vaccine's effectiveness and safety. An incorrect route, such as subcutaneous, increases the risk of adverse reactions like BCG-induced abscess and lymphadenitis.
Nurses must educate parents/caregivers about the normal evolution of the BCG vaccination site: a papule appears in 2-3 weeks, may ulcerate, and heals in 6-12 weeks, leaving a permanent scar. This is a normal and expected reaction.
The presence of the BCG scar is often used as a marker of prior vaccination during health check-ups.

How to Approach the Question

This is a factual recall question that tests your knowledge of immunization schedules and procedures.
First, identify the specific vaccine mentioned in the question, which is the BCG vaccine.
Recall the standard administration protocol for BCG. This vaccine has a unique and specific route that differs from most other common vaccines.
Evaluate the given options: Oral, Intradermal, Subcutaneous, and Intramuscular.
Associate the other routes with vaccines you know. For example, Oral is for Polio, and Intramuscular is for DTP/Hepatitis B.
Select the option that correctly matches the administration route for BCG, which is Intradermal.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 41-43

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 99-101

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Attempt every question from this paper in a timed mock, then review the full solution for each one.