People ages 6 months and older are recommended to receive 1 bivalent mRNA booster dose after completion of any FDA-approved or FDA-authorized primary series or previously received monovalent booster dose(s) with the following exception: children ages 6 months - 4 years who receive 2 primary series doses of a monovalent Pfizer-BioNTech vaccine and 1 bivalent Pfizer-BioNTech vaccine for the third primary series dose are not authorized to receive a booster dose at this time.
Monovalent mRNA vaccines are not authorized as a booster dose.

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