After spending two years in forced isolation on a remote island in the East River, Mary Mallon fought back, insisting that she posed no danger to the public and city officials had overstepped their authority in keeping her against her will. She finally managed to secure her freedom after pledging to leave the profession of cooking for good in order to keep the public safe.

But over the next several years health officials struggled to keep track of Mary’s whereabouts, along with hundreds of other “healthy carriers” of typhoid in New York just like her. She eventually slipped out of sight. Then a deadly outbreak of typhoid struck a maternity hospital in Manhattan, and Health officials were back on the hunt.

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