Mary Mallon

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Mary Mallon (September 23, 1869 – November 11, 1938), commonly known as Typhoid Mary, was an Irish-born cook who lived in the United States from a young age and is believed to have infected up to fifty-seven people with the bacteria that cause typhoid fever. The infections caused three confirmed deaths. She was the first person in the U.S. to be identified as an asymptomatic carrier of Salmonella typhi bacteria. Between 1897 and 1907, Mallon worked at the houses of several New York–based families; members of four of the households contracted typhoid. An investigation by George Soper, an epidemiologist at the New York Department of Health, identified Mallon as the potential disease vector. In 1907, she was forcibly quarantined at the Riverside Hospital, an institution for those with quarantinable diseases, on North Brother Island in New York City's East River. She was released in 1910 after she swore to report to the health department every quarter and not return to cooking as a career....

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