Moderna Seeks FDA Emergency Authorization for 4th COVID-19 Vaccine Shot

A vial of Moderna's COVID-19 vaccine in Los Angeles, Calif., on Dec. 15, 2021. Frederic J. Brown/AFP via Getty Images

Moderna has requested the U.S. Food and Drug Administration (FDA) for emergency use authorization of a fourth COVID-19 vaccine dose for all adults aged 18 and above.

The request is broader than that of rival pharmaceutical company Pfizer, which requested earlier this week for the regulator to approve a booster shot for all adults aged 65 and above.