Featured Article Summary #259

Mary Mallon, also known as “Typhoid Mary,” was an Irish-born cook who lived in the United States and is believed to have infected up to fifty-seven people with typhoid fever, causing three confirmed deaths. She worked in several New York homes from 1897 to 1907, and people in four households became ill. In 1907, after an investigation, she was identified as spreading the disease even without showing symptoms, and she was forcibly quarantined at a hospital on North Brother Island. She was released in 1910 only after agreeing to check in with health officials and to stop working as a cook, but she later became linked to another outbreak in 1915 and was sent back to the island, where she stayed until her death in 1938. Her case sparked debates about how public health protections can conflict with personal freedom, especially because she was treated differently from other asymptomatic carriers. Her story has been reconsidered during later health crises such as HIV/AIDS, tuberculosis, and COVID-19. Mary Mallon was born on September 23, 1869, in Cookstown, County Tyrone, to John Mallon and Catherine Igo. She had some schooling, but her exact education level is unknown. Around age fifteen in 1883, she moved to the United States, living first with an aunt in New York City, then working as a private cook for wealthy families where she earned good wages and built a strong reputation, often in live-in roles. Her career path was shaped by the limited job options available to unmarried women from her background and social class. From 1897 to 1906, Mary Mallon worked as a cook for several families, and in multiple households people—including staff—became ill with typhoid fever. Cases were linked at different times to servants such as the laundress or footman, though in some investigations the source could not be proven. In 1906, while working for banker Charles Henry Warren, several of his children and other family members became ill after one daughter fell sick, and they all recovered. After learning there were typhoid cases tied to Mary Mallon’s work, sanitation investigator George Soper ruled out common sources like sick contacts and contaminated food and water, and instead suspected Mallon was carrying the disease without showing symptoms. He traced many outbreaks to families where she cooked, then tested his idea by trying to collect samples from her, but Mallon refused and attacked the officials sent to persuade her. Soper reported the results, and she was eventually detained, where repeated stool tests confirmed she had typhoid bacteria that did not respond to drug treatment, so she was held in hospital isolation for years. In 1909, Mary Mallon challenged her confinement in court using a habeas corpus writ, drawing major public attention through coverage in the New York American. Her case led to a ruling in mid-July that she must remain confined, supported by the 1905 Supreme Court decision that states could enforce public-health measures like vaccination. In 1910, New York’s health commissioner Ernst J. Lederle released her from North Brother Island after she agreed to follow strict rules, including reporting regularly and not working as a cook. Even after her release, officials struggled to track her, and later she was linked (without clear proof in some claims) to additional typhoid cases, including an outbreak at Sloane Maternity Hospital in early 1915 that resulted in 25 cases and two deaths.