In this Monday, 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. On Sept. 18, President Trump said he expects some 100 million doses of a coronavirus vaccine could be distributed by the year's end. (AP Photo/Hans Pennink) **FILE**
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