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, 2019*? Yes 1 dose of 2019−20 influenza vaccine  
      NoDon’t know     No/Don’t know        
    2 doses of 2019−20  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, Alyanak E, Broder KR, Walter EB, Fry AM, Jernigan DB. Prevention and Control of Seasonal Influenza with Vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2019–20 Influenza Season. MMWR Recomm Rep 2019;68(No. RR-3):1–21.

(Rev. 9/2019)