Kevin Fisher, of Quincy, Mass., left, receives his second shot of Moderna COVID-19 vaccine from RN Katherine Francisco, of Avon, Mass., right, at a mass vaccination clinic, Wednesday, May 19, 2021, at Gillette Stadium, in Foxborough, Mass. A month after every adult in the U.S. became eligible for the vaccine, a distinct geographic pattern has emerged: The highest vaccination rates are concentrated in the Northeast, while the lowest ones are mostly in the South. Steven Senne/AP Photo