The mother of four brought her children, ranging in age from grade school to high school, to the doctor’s office last summer for their annual checkup. When their pediatrician, Robert Froehlke, said that it was time for shots and several boosters and then mentioned the Covid vaccine, her reaction stunned him. “I’m not going to kill my children,” Froehlke recalls her saying, as she began to shake and weep. He ushered her out of the examination room, away from her children, and tried to calm her. “We’re just trying to help your kids be healthy,” he told her. But he didn’t press the issue; he sensed that she wasn’t persuadable at that moment. And he didn’t want to drive her away from his practice altogether. “That really shook me up,” he says.