WASHINGTON (Michigan News Source) – Children as young as 6-months-old will be eligible to get a dose of the updated COVID-19 vaccines following a decision to expand emergency use authorization for the shots from Moderna and Pfizer-BioNTech.

The Food and Drug Administration (FDA) announced the expanded authorization on Thursday. This move cleared all recipients of Moderna’s COVID-19 vaccine to get a booster dose from the company’s newest “bivalent” vaccines. The company says those vaccines are tailored to  Omicron variants.

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However, only a portion of the youngest kids who got Pfizer-BioNTech’s shots will be eligible to get a shot of their updated COVID vaccine this year.

The FDA had previously greenlighted Pfizer’s shots in this age group as a three dose “primary series,” after data suggested kids from 6 months old to 4-years-old needed a third kid-sized dose to get protection on par with adults after two doses.

Now the FDA says only kids who have yet to complete their third dose can swap out the last shot for an updated vaccine.