U.S. Air Force Senior Master Sgt. Shareef Cardwell, 52nd Medical Operations Squadron superintendent, fills a syringe during a COVID-19 vaccination disbursement Jan. 4, 2021, at Spangdahlem Air Base, Germany. Full effectiveness of the COVID-19 vaccine requires two doses beginning with the initial dose, and then following up with a second dose 28 days later. (U.S. Air Force photo by Senior Airman Melody W. Howley)
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