Difficulty: Medium
Average Score: 82%
Simulated
A parent asks why it is recommended that the second dose of the measles, mumps, and rubella (MMR) vaccine be given at 4 to 6 years of age? The nurse should explain to the parent that the second dose is given at this age for what reason?
Rationale
The second MMR dose ensures long-term immunity, as some children may not respond fully to the first dose.