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Last week, the U.S. Food and Drug Administration (FDA) authorized second booster doses of the COVID-19 vaccines made by Pfizer-BioNTech and Moderna. This authorization applies to individuals age 50 and older, as well as certain immunocompromised people ages 12 and older.

Dr. Rochelle P. Walensky, the director of the Centers for Disease Control and Prevention (CDC), said that second boosters are “especially important for those 65 and older and those 50 and older with underlying medical conditions that increase their risk for severe disease from COVID-19.”

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