In a long-awaited announcement on Monday, the U.S. Food and Drug Administration authorized the use of the Pfizer-BioNTech COVID-19 mRNA vaccine in adolescents aged 12 to 15. The Centers for Disease Control and Prevention’s Advisory Committee of Immunization Practices (ACIP) at the Centers for Disease Control and Prevention met on Wednesday to discuss using the vaccine in adolescents and formally recommended immunizing this age group.