Home / Ask The Experts / Immunocompromised patients who are given mRNA vaccine are recommended to receive an age-appropriate 3-dose initial series. What dose do I use for a severely immunocompromised patient that starts the initial series at age 11 years but turns 12 before completing the 3-dose primary series?

COVID-19
For Children under 12 Years

Immunocompromised patients who are given mRNA vaccine are recommended to receive an age-appropriate 3-dose initial series. What dose do I use for a severely immunocompromised patient that starts the initial series at age 11 years but turns 12 before completing the 3-dose primary series?

Moderately or severely immunocompromised children who transition from age 11 years to age 12 years during the initial vaccination series should complete the 3-dose series using the dosage for people ages 12 years and older for all doses received once they are age 12 years.

See www.cdc.gov/covid/hcp/vaccine-considerations/immunocompromised.html for additional details.

Last reviewed: November 16, 2025

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This page was updated on November 16, 2025.