Influenza Vaccine Dosing Algorithm: 6 Months-8 Years

For children aged 8yrs who require 2 doses of influenza vaccine, both doses should be administered even if the child turns 9yrs old between receipt of dose 1 and dose 2.

*The 2 doses need not have been received during the same season or consecutive seasons.

†Doses should be administered at least 4 weeks apart.


Grohskopf LA, Alyanak E, Broder KR, et al. Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2020–21 Influenza Season. MMWR Recomm Rep. 2020;69(No. RR-8):1–24. DOI:

(Rev. 9/2020)