In early March 2020, Rick Phillips, 63, and his wife, Sheryl Phillips, quietly cloistered themselves in their Indianapolis home. They swore off markets, movie theaters, the gym, and, hardest of all, visits with their three young grandchildren. This April, three weeks after receiving her second shot of Pfizer's vaccine, Sheryl broke her social fast and walked into a grocery store for the first time since last spring. Rick has yet to join her. He received his shots on the same days his wife received hers. By official standards, he, too, can count himself as fully vaccinated. But he feels that he cannot act as though he is. “I personally remain scared to death,” he told me.