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, 2021*? Yes 1 dose of 2021−22 influenza vaccine  
      NoDon’t know     No/Don’t know        
    2 doses of 2021−22  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.


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Grohskopf LA, Alyanak E, Ferdinands JM, et al. Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices, United States, 2021–22 Influenza Season. MMWR Recomm Rep. 2021;70(No. RR-5):1–28. DOI:

(Rev. 9/2021)

This article originally appeared on MPR