Which vaccines are typically given as boosters around 12–15 months?

• A. Hib and PCV13 boosters
• B. MMR and Varicella boosters
• C. HepB booster
• D. DTaP

Answer: (A)

Boosters at this age are used to refresh immunity that was started in infancy and may wane over time, ensuring continued protection during a period of high exposure. Hib and PCV13 have booster doses scheduled around 12–15 months to raise antibody levels after the initial infant priming and to maintain protection against invasive diseases caused by Haemophilus influenzae type b and Streptococcus pneumoniae. The goal here is to keep immunity strong as kids enter ages with more interaction in daycare and shared environments.

In contrast, the vaccines given at 12–15 months for MMR and Varicella are first doses, not boosters, so their job is to initiate protection rather than restore waning immunity. HepB booster is not routinely given at this age. DTaP does have a later booster dose, typically around 15–18 months, which falls just outside the 12–15 month window.