Typhoid Mary: An RC Inspired by IIM Indore

In March 1907 officials of the New York City health department and police took a cook named Mary Mallon from a house on Park Avenue and sent her to a hospital. She was strong and never ill, and she insisted that she had never had typhoid. The tests found the bacterium in her stool. She would spend about twenty six of the next thirty one years confined on North Brother Island and her name would become the label for any healthy person suspected of spreading disease.

The case rested on the work of George Soper, a sanitary engineer hired in 1906 after typhoid struck a rented house at Oyster Bay. Soper traced the cook through her earlier jobs and found that outbreaks seemed to follow her from one kitchen to the next. The idea that a healthy person could carry a germ was still unfamiliar to many doctors, and Mallon, who had no symptoms, could not see why her own body should be treated as the source of harm.

The danger was real. Typhoid spreads through food and water contaminated with faeces, and a cook who does not wash her hands can infect a household without knowing it. Soper later linked her to dozens of cases and at least a few deaths. She was released in 1910 on condition that she would not cook for others, but went back to kitchens under another name. In 1915 an outbreak at the Sloane Hospital for Women in Manhattan was traced to her, and she was sent back to the island.

The idea that a healthy person could carry a germ meant that the state could now accuse a body of a crime that its owner had never felt. Yet the fairness of her fate looks less settled the closer it is examined. Mallon was held without a trial, on a laboratory result that she did not accept, and a court refused her petition for release in 1909. She was far from the only carrier. Officials found many others, and most stayed free after being told which jobs to avoid. A defender of the city can answer that Mallon alone broke her promise and cooked again under a false name. That answer justifies the second confinement far better than the first, and it does not explain why she alone was held.

The idea that a healthy person could carry a germ meant that the state could now accuse a body of a crime that its owner had never felt.

Every later epidemic has met the same problem. Public health protects people who will never know it, and it often does so by restricting someone who has done nothing but exist. Mallon was a poor Irish immigrant woman whose trade was cooking, and historians such as Judith Walzer Leavitt have asked whether a richer or male carrier would have been handled in the same way. The question cannot be tested, because no one can run 1907 a second time.

Mallon is reported to have insisted that she was persecuted until a stroke in 1932 left her paralysed, and she died on the island in 1938. An autopsy is said to have found live typhoid bacteria in her gallbladder. The germ she was accused of carrying was still inside her at the end, which confirms that the city was right about the biology and settles nothing about whether it was right about her.