" Why do you want me to stay?” she asked unhappily. He looked at her without a definite answer in his mind. Then he said, “Even if you are infected, I can’t let you go out there. You don’t know what they’d do to you.” Her eyes closed. “I don’t care,” she said. CHAPTER SEVENTEEN “I don’t understand it,” he told her over supper. "

― Richard Matheson , I Am Legend