Mary Mallon

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Mary Mallon
A Caucasoid woman with dark hair is lying in a hospital bed; she is looking at the camera, pictured from her mid-torso through the wall behind her head.
Mallon in 1909
Born(1869-09-23)September 23, 1869
DiedNovember 11, 1938(1938-11-11) (aged 69)
Riverside Hospital, North Brother Island, New York, US
Resting placeSaint Raymond's Cemetery, The Bronx, New York, US
Other names
  • Mary Brown
  • "Typhoid Mary"
Known forAsymptomatically carrying of typhoid fever

Mary Mallon (September 23, 1869 – November 11, 1938), also known as Typhoid Mary, was an Irish-born cook believed to have infected 51 people, three of whom died, with typhoid fever, and the first person in the United States identified as an asymptomatic carrier of the disease.[1] Because she persisted in working as a cook, by which she exposed others to the disease, she was twice forcibly isolated by authorities, and died after a total of nearly three decades in isolation.[2][3]

Early life

Mary Mallon was born in 1869 in Cookstown, County Tyrone, in what is now Northern Ireland. She migrated to the United States in 1883 or 1884.[4][5] She lived with her aunt and uncle for a time and later found work as a cook for affluent families.[6]


From 1900 to 1907, Mallon worked as a cook in the New York City area for seven families.[7] In 1900, she worked in Mamaroneck, New York, where, within two weeks of her employment, residents developed typhoid fever. In 1901, she moved to Manhattan, where members of the family for whom she worked developed fevers and diarrhea, and the laundress died. Mallon then went to work for a lawyer and left after seven of the eight people in that household became ill.[8]

In August 1906, Mallon took a position in Oyster Bay, Long Island, and within two weeks 10 of the 11 family members were hospitalized with typhoid.[9] She changed jobs again, and similar occurrences happened in three more households.[8] She worked as a cook for the family of a wealthy New York banker, Charles Henry Warren. When the Warrens rented a house in Oyster Bay for the summer of 1906, Mallon went along, too. From August 27 to September 3, six of the 11 people in the family came down with typhoid fever. The disease at that time was "unusual" in Oyster Bay, according to three medical doctors who practiced there.[citation needed] Mallon was subsequently hired by other families, and outbreaks followed her.[8]


In late 1906, one family hired a typhoid researcher named George Soper to investigate. Soper published the results on June 15, 1907, in the Journal of the American Medical Association. He believed Mallon might have been the source of the outbreak.[10] He wrote:

It was found that the family changed cooks on August 4. This was about three weeks before the typhoid epidemic broke out. The new cook, Mallon, remained in the family only a short time and left about three weeks after the outbreak occurred. Mallon was described as an Irish woman about 40 years of age, tall, heavy, single. She seemed to be in perfect health.[11]

Soper discovered that a female Irish cook, who fit the physical description he was given, was involved in all of the outbreaks. He was unable to locate her because she generally left after an outbreak began, without giving a forwarding address. Soper learned of an active outbreak in a penthouse on Park Avenue and discovered Mallon was the cook. Two of the household's servants were hospitalized, and the daughter of the family died of typhoid.[8]

When Soper approached Mallon about her possible role in spreading typhoid, she adamantly rejected his request for urine and stool samples.[12] Since Mallon refused to give samples, he decided to compile a five-year history of Mallon's employment. Soper found that of the eight families that hired Mallon as a cook, members of seven claimed to have contracted typhoid fever.[13] On his next visit, he took another doctor with him but again was turned away. During a later encounter when Mallon was herself hospitalized, he told her he would write a book and give her all the royalties. She angrily rejected his proposal and locked herself in the bathroom until he left.[14]

First quarantine (1907–1910)

Mary Mallon (foreground) in a hospital bed

The New York City Health Inspector determined she was a carrier. Under sections 1169 and 1170 of the Greater New York Charter, Mallon was held in isolation for three years at a clinic located on North Brother Island.[8]

In prison, she was forced to give stool and urine samples. Authorities suggested removing her gallbladder because they believed typhoid bacteria resided there.[15] However, she refused as she did not believe she carried the disease. She was also unwilling to cease working as a cook.[8]

Mallon attracted so much media attention that she was called "Typhoid Mary" in a 1908 issue of the Journal of the American Medical Association. Later, in a textbook that defined typhoid fever, she was again called "Typhoid Mary".[16]

Eventually, Eugene H. Porter, the New York State Commissioner of Health, decided that disease carriers should no longer be kept in isolation and that Mallon could be freed if she agreed to stop working as a cook and take reasonable steps to prevent transmitting typhoid to others. On February 19, 1910, Mallon agreed that she was "prepared to change her occupation (that of a cook), and would give assurance by affidavit that she would upon her release take such hygienic precautions as would protect those with whom she came in contact, from infection." She was released from quarantine and returned to the mainland.[17]

Release and second quarantine (1915–1938)

Upon her release, Mallon was given a job as a laundress, which paid less than cooking. After several unsuccessful years of working as a laundress, she changed her name to Mary Brown and returned to her former occupation despite having been explicitly instructed not to. For the next five years, she worked in a number of kitchens; wherever she worked, there were outbreaks of typhoid. However, she changed jobs frequently, and Soper was unable to find her.[8]

In 1915, Mallon started another major outbreak, this time at Sloane Hospital for Women in New York City. Twenty-five people were infected, and two died. She again left, but the police were able to find and arrest her when she took food to a friend on Long Island.[8][17] After arresting her, public health authorities returned her to quarantine on North Brother Island on March 27, 1915. She was still unwilling to have her gallbladder removed.[17]

Mallon remained confined for the remainder of her life. She became a minor celebrity and was occasionally interviewed by the media. They were told not to accept even water from her.[8] Later, she was allowed to work as a technician in the island's laboratory, washing bottles.[10]


Mallon spent the rest of her life in quarantine at the Riverside Hospital. Six years before her death, she was paralyzed by a stroke. On November 11, 1938, she died of pneumonia at age 69.[1] A post-mortem found evidence of live typhoid bacteria in her gallbladder.[18] George Soper wrote however, "There was no autopsy",[19] a claim cited by other researcher to assert a conspiracy to calm public opinion after her death.[citation needed] Mallon's body was cremated, and her ashes were buried at Saint Raymond's Cemetery in the Bronx.[20]


A historical poster warning against acting like Typhoid Mary

Among the infections Mallon caused, at least three deaths were attributed to her; however, because of her use of aliases and refusal to cooperate, the exact number is not known. Some have estimated that she may have caused 50 fatalities.[8]

Other healthy typhoid carriers identified in the first quarter of the 20th century include Tony Labella, an Italian immigrant, presumed to have caused over 100 cases (with five deaths); an Adirondack guide dubbed "Typhoid John", presumed to have infected 36 people (with two deaths); and Alphonse Cotils, a restaurateur and bakery owner.[21]

Today, "Typhoid Mary" is a colloquial term for anyone who, knowingly or not, spreads disease or some other undesirable thing.[22]


  1. ^ a b "'Typhoid Mary' Dies Of A Stroke At 68. Carrier of Disease, Blamed for 51 Cases and 3 Deaths, but Immune". The New York Times. November 12, 1938. Archived from the original on June 5, 2011. Retrieved February 28, 2010. Mary Mallon, the first carrier of typhoid bacilli identified in America and consequently known as Typhoid Mary, died yesterday in Riverside Hospital on North Brother Island.
  2. ^ The Gospel of Germs: Men, Women, and the Microbe in American Life, ISBN 0674357086
  3. ^ Typhoid Mary: An Urban Historical, ISBN 160819518X
  4. ^ Cliff, Andrew; Smallman-Raynor, Matthew (2013). Oxford Textbook of Infectious Disease Control: A Geographical Analysis from Medieval Quarantine to Global Eradication. Oxford University Press. p. 86. ISBN 978-0-199-59661-4.
  5. ^ Walzer Leavitt, Judith (1996). Typhoid Mary: Captive to the Public's Health. Putnam Publishing Group. ISBN 978-0807021026.
  6. ^ Kenny, Kevin (2014). The American Irish: A History. Routledge. p. 187. ISBN 978-1-317-88916-8.
  7. ^ Job Readiness for Health Professionals: Soft Skills Strategies for Success. Elsevier Health Sciences. 2012. p. 56. ISBN 978-1-455-73771-0.
  8. ^ a b c d e f g h i j Dex and McCaff (August 14, 2000). "Who was Typhoid Mary?". The Straight Dope.CS1 maint: uses authors parameter (link)
  9. ^ "Typhoid Mary". Retrieved March 25, 2020.
  10. ^ a b Ochs, Ridgely (2007). "Dinner with Typhoid Mary". Newsday.
  11. ^ "Dinner With Typhoid Mary" (PDF). FDA.
  12. ^ Soper, George A. (June 15, 1907). "The work of a chronic typhoid germ distributor". J Am Med Assoc. 48 (24): 2019–22. doi:10.1001/jama.1907.25220500025002d.
  13. ^ Satin, Morton (2007). Death in the Pot. New York: Prometheus Books. p. 169.
  14. ^ "The Most Dangerous Woman In America". Nova. Episode 597. October 12, 2004. Event occurs at 28:42-29:52. PBS. Retrieved August 31, 2014.
  15. ^ Brooks, J (March 15, 1996). "The sad and tragic life of Typhoid Mary". CMAJ: Canadian Medical Association Journal. 154 (6): 915–916. ISSN 0820-3946. PMC 1487781. PMID 8634973.
  16. ^ Satin, Morton (2007). Death in the Pot. New York: Prometheus Books. p. 171.
  17. ^ a b c "Food Science Curriculum" (PDF). Illinois State Board of Education. p. 118. Archived from the original (PDF) on December 18, 2010. Retrieved February 9, 2011.
  18. ^ Marineli, Filio; Tsoucalas, Gregory; Karamanou, Marianna; Androutsos, George (2013). "Mary Mallon (1869-1938) and the history of typhoid fever". Annals of Gastroenterology. 26 (2): 132–133. PMC 3959940. PMID 24714738.
  19. ^ Soper, George A. (October 1939). "The Curious Career of Typhoid Mary". Bulletin of the New York Academy of Medicine. 15 (10): 698–712. PMC 1911442. PMID 19312127.
  20. ^ Satin, Morton (December 2, 2009). Death in the Pot: The Impact of Food Poisoning on History. Prometheus Books. p. 174. ISBN 978-1-615-92224-6.
  21. ^ "Epidemiology". March 2001. Archived from the original on March 3, 2016.
  22. ^ "Dictionary Reference Website: Typhoid Mary". Retrieved March 23, 2020.

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