EditorialDirector of nursing education Loraine Hopkins Pepe, left, administers the Pfizer BioNTech COVID-19 vaccine to Dr. Richard Fine, head of anesthesiology, at Einstein Medical Center in Philadelphia, Dec. 16, 2020. (Hannah Yoon/The New York Times)
EditorialBrian Ho, an anesthesiology assistant, receives his first dose of the Pfizer-BioNTech COVID-19 vaccine at Mercy Hospital St. Louis in Creve Coeur, Mo., on Monday, Dec. 14, 2020. (Whitney Curtis/The New York Times)