A clinic nurse prepares to administer an MMR (Measles, Mumps, Rubella) vaccine to a five-year-old. The nurse administers this vaccine:

Appeared in: OSSSC Nursing Officer-2021

Explanation

The Measles, Mumps, and Rubella (MMR) vaccine is a live attenuated vaccine.
The standard and correct route of administration for the MMR vaccine is subcutaneous (SC).
For a five-year-old child, the preferred site for an SC injection is the fatty tissue on the outer aspect of the upper arm, over the triceps muscle.
This route and site ensure slow absorption and an optimal immune response while minimizing local reactions.

Option A: This option suggests an intramuscular (IM) route, which is incorrect for the MMR vaccine. The site (anterolateral thigh) is typically used for IM injections in infants, not for SC injections in a 5-year-old.
Option B: This option suggests an intramuscular (IM) route. The MMR vaccine is administered subcutaneously, not intramuscularly.
Option D: While the route (subcutaneous) is correct, the site (gluteal muscle) is wrong and dangerous for children. Injections in the gluteal region are avoided due to the risk of sciatic nerve damage.

Clinical Relevance

Nursing practice connection: Knowing MMR vaccine administration route and site for a pediatric patient helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Correct administration technique is critical for vaccine efficacy and patient safety. Giving a subcutaneous vaccine via the wrong route (e.g., intramuscularly) can alter the immune response and increase the risk of local adverse reactions.
Nurses must always verify the 'five rights' of medication administration, which includes the right route and right site, before giving any vaccine.
What if? If the vaccine were DTaP instead of MMR, the correct answer would be 'Intramuscularly in the deltoid muscle' (Option B), as DTaP is an IM vaccine and the deltoid is the preferred site for a 5-year-old.

How to Approach the Question

First, identify the key information in the question: the type of vaccine (MMR), the patient's age (five-year-old), and the task (administration).
Recall the specific properties of the MMR vaccine. It is a live attenuated virus vaccine.
Remember the standard administration route for most live attenuated injectable vaccines, which is subcutaneous (SC). This immediately helps you eliminate the intramuscular (IM) options.
Now you are left with two subcutaneous options. Evaluate the injection sites.
Recall the recommended injection sites for children. The gluteal muscle is contraindicated due to the risk of sciatic nerve injury.
This leaves the outer aspect of the upper arm as the only safe and correct option.

Concept Tested & Keywords

Concept Tested: MMR vaccine administration route and site for a pediatric patient.
Stem keywords: MMR vaccine, five-year-old, administer
Lead-in keywords: administers this vaccine
Negative lead-in flag: false

Q0JVU5adyfPo2oOSx54-6y

E6 Ghai Essential Pediatrics(pp 26-904 of 913) pp. 198-200, 187-189

Practise the full OSSSC Nursing Officer-2021

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