FILE - 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. An influential scientific panel on Tuesday, Dec. 1, is set to tackle one of the most pressing questions in the U.S. coronavirus epidemic: When the first doses of COVID-19 vaccine become available, who should be at the front of the line for shots? (AP Photo/Hans Pennink, File)

FILE - In this March 16, 2020, file photo, pharmacist Michael Witte holds a tray with a syringe containing a shot that will be used in the first clinical trial of a potential vaccine for COVID-19 at the Kaiser Permanente Washington Health Research Institute in Seattle. An influential scientific panel on Tuesday, Dec. 1, is set to tackle one of the most pressing questions in the U.S. coronavirus epidemic: When the first doses of COVID-19 vaccine become available, who should be at the front of the line for shots? (AP Photo/Ted S. Warren, File)

FILE - In this March 16, 2020, file photo, vials used by pharmacists to prepare syringes used on the first day of a first clinical trial of the potential vaccine for COVID-19 rest on a lab table at the Kaiser Permanente Washington Health Research Institute in Seattle. An influential scientific panel on Tuesday, Dec. 1, is set to tackle one of the most pressing questions in the U.S. coronavirus epidemic: When the first doses of COVID-19 vaccine become available, who should be at the front of the line for shots? (AP Photo/Ted S. Warren, File)

Dr. Shane Wilson, right, touches the back of COVID-19 patient Glen Cowell while listening to Cowell's lungs through a stethoscope at Scotland County Hospital Tuesday, Nov. 24, 2020, in Memphis, Mo. Cowell didn't think much about the coronavirus until it knocked him to his knees a few weeks ago, eventually landing him in the only hospital for miles around in the remote northeastern part of Missouri. (AP Photo/Jeff Roberson)

Registered nurse Shelly Girardin, left, is illuminated by the glow of a computer monitor as Dr. Shane Wilson examines COVID-19 patient Neva Azinger inside Scotland County Hospital on Tuesday, Nov. 24, 2020, in Memphis, Mo. The coronavirus pandemic largely hit urban areas first, but the autumn surge is now ravaging rural America, stressing the staffs of tiny hospitals like the one in Scotland County. (AP Photo/Jeff Roberson)