Thanks to those who helped me research, write, and polish this book:
Dr. Eric Mintz, lead for the Centers for Disease Control and Prevention’s Global Water, Sanitation, and Hygiene Epidemiology Team, for graciously sharing his expertise, sending me relevant scientific papers, and checking the accuracy of the typhoid information in my manuscript.
Dr. Judith Walzer Leavitt, professor emerita, Department of Medical History and Bioethics, University of Wisconsin—Madison, who took the time to answer my lingering questions about Mary Mallon.
Dr. Mark McKinlay, director of the Center for Vaccine Equity, the Task Force for Global Health, for his assistance in getting answers to my technical questions.
Susan Soper, who helped me piece together details about the life of her great-grandfather George A. Soper.
Peter Dabback, science teacher in the Spring-Ford Area School District, Royersford, Pennsylvania, who connected me with typhoid fever experts.
The staffs at the Division of Rare and Manuscript Collections, Cornell University Library; the Newspaper & Current Periodical Reading Room, Library of Congress; and the Microforms Reading Room, Schwarzman Building, New York Public Library.
The entire team at Calkins Creek, who brought my manuscript to print. I’m particularly grateful to Joan Hyman for her eagle eye. Special thanks go to Carolyn P. Yoder, my incomparable editor, for once again accompanying me on a journey into history.
Finally, I appreciate the support of my patient and tolerant husband, Robert Jarrow. He never once complained about my unappetizing typhoid fever dinner conversations.
—GJ