In this Tuesday, Dec. 29, 2020 file photo, a county health department worker fills out a vaccination record card before administering the Moderna COVID-19 vaccine to emergency medical workers and healthcare personnel at the Chester County Government Services Center in West Chester, Pa. The first coronavirus vaccines in the U.S. require two shots taken weeks apart, and you’ll be given a record card so you know when to go back for the second dose. (AP Photo/Matt Slocum)

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EXPLAINER: How do I know when to get my 2nd vaccine shot?

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