FILE - In this July 27, 2020, file photo, a nurse prepares a shot as a study of a possible COVID-19 vaccine, developed by the National Institutes of Health and Moderna Inc., gets underway in Binghamton, N.Y. The U.S. is poised to give the green light as early as Friday, Dec. 18, to a second COVID-19 vaccine, a critical new weapon against the surging coronavirus. Doses of the vaccine developed by Moderna Inc. and the National Institutes of Health will give a much-needed boost to supplies as the biggest vaccination effort in the nation’s history continues. (AP Photo/Hans Pennink, File)
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