Influenza Vaccine Dosing Algorithm: 6 Months-8 Years

Influenza Vaccine Dosing Algorithm: 6 Months-8 Years
  Did the child receive at least 2 total doses of trivalent or quadrivalent vaccine before July 1, 2022*? Yes 1 dose of 2022−23 influenza vaccine  
      No or unknown    No or unknown       
    2 doses of 2022−23  influenza vaccine

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, Blanton LH, Ferdinands JM, et al. Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2022–23 Influenza Season. MMWR Recomm Rep. 2022;71(No. RR-1):1–28. DOI:

(Rev. 9/2022)