In this July 27, 2020, file photo, Nurse Kathe Olmstead, right, gives volunteer Melissa Harting, of Harpersville, N.Y., an injection 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. A letter from federal health officials instructing states to be ready to begin distributing a vaccine by Nov. 1 — two days before the election — has met, not with exhilaration, but with suspicion among public health experts and others. (AP Photo/Hans Pennink, File)
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