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FILE - In this March 16, 2020 file photo, a pharmacist gives Jennifer Haller, left, the first shot in the first-stage safety study clinical trial of a potential vaccine for COVID-19, the disease caused by the new coronavirus, at the Kaiser Permanente Washington Health Research Institute in Seattle. The world's biggest COVID-19 vaccine test got underway Monday, July 27 with the first of 30,000 planned volunteers. The experimental vaccine is made by the National Institutes of Health and Moderna Inc., and it's one of several candidates in the final stretch of the global vaccine race. (AP Photo/Ted S. Warren, File)
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Other potential concerns are more human. Convincing people to show up to get a vaccine not once, but twice, could be a formidable undertaking.
