According to the universal immunization schedule, the nurse is administering the oral Rotavirus vaccine (Rotarix) to a 6-week-old infant. What is the standard volume for a single dose of this vaccine?

1. A

   0.1 mL

2. B

   0.5 mL

3. C

   1.5 mL

4. D

   2.5 mL

Appeared in: NORCET 9 Prelims-2025

Explanation

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• 5 mL, which is the standard single-dose volume for the liquid formulation of the Rotarix (RV1) oral vaccine.
• Rotarix is a monovalent vaccine, meaning it targets one strain of the rotavirus.
• It is supplied in a pre-filled oral applicator containing a 1.5 mL dose, which is administered entirely.
• Knowledge of specific vaccine brands and their corresponding doses is essential, as different rotavirus vaccines like Rotavac (0.5 mL) and Rotasiil (2.5 mL) have different volumes.

Why Other Options Were Wrong

• Option A: A dose of 0.1 mL is incorrect for Rotarix. This volume is characteristic of intradermal vaccines.
• Option B: A dose of 0.5 mL is incorrect for Rotarix. This is the dose for a different brand of rotavirus vaccine or for many injectable vaccines.
• Option D: A dose of 2.5 mL is incorrect for Rotarix. This is the dose for another brand of rotavirus vaccine.

Related Visual

• Visual 1: Comparison Chart - A chart detailing the different types of rotavirus vaccines (Rotarix, Rotavac, Rotasiil, RotaTeq) with their brand names, dose volumes, number of doses, and routes of administration.
• Visual 2: Image - A photograph showing the pre-filled oral applicators for Rotarix (1.5 mL) and Rotavac (5 drops) side-by-side to visually emphasize the difference in volume and packaging.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Dosage of Rotavirus Vaccines to guide bedside assessment, documentation, and the next nursing action.
• Administering the correct dose volume is a critical nursing responsibility to ensure vaccine efficacy and patient safety. A medication error could lead to under-dosing (reducing protection) or over-dosing.
• Nurses must always perform the 'rights' of medication administration, including checking the specific drug name (e.g., Rotarix vs. Rotavac) and the corresponding correct dose before administration.
• What if? If the nurse was administering Rotavac instead of Rotarix, the correct dose would be 5 drops (approximately 0.5 mL), not 1.5 mL. This highlights the critical need for brand-specific knowledge to prevent significant dosing errors.

How to Approach the Question

• Step 1: Identify the core question. The question asks for the specific dose volume of a named vaccine.
• Step 2: Pinpoint the key information provided in the stem: the vaccine is 'Rotavirus vaccine (Rotarix)'.
• Step 3: Recognize this as a factual recall question. The answer depends on knowing the standard administration details for this specific vaccine.
• Step 4: Mentally differentiate the Rotarix dose from the doses of other common rotavirus vaccines (like Rotavac, Rotasiil, RotaTeq), which serve as likely distractors.
• Step 5: Select the option that matches the correct dose for the liquid formulation of Rotarix, which is 1.5 mL.

Concept Tested & Keywords

• Concept Tested: Dosage of Rotavirus Vaccines
• Stem keywords: universal immunization schedule, Rotavirus vaccine, Rotarix, 6-week-old infant, dose volume
• Lead-in keywords: What is the standard volume
• Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

Question ID

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