Question:
Why do children under 9 receiving the influenza vaccine for the first time need two doses?
Answer:
Children under 9 years of age who have never had a seasonal influenza vaccine need 2 doses for best protection. The first dose of the influenza vaccine “primes” the immune system but may not result in high levels of protection. A second dose is needed to raise their level of protection.
Date last reviewed:
Thursday, Aug 18, 2022