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https://stairnaheireann.net/2014/11/11/1938-death-of-mary-mallon-born-in-cookstown-county-tyrone-also-known-as-typhoid-mary-she-was-the-first-person-in-the-united-states-identified-as-an-asymptomatic-carrier-of-the-pathogen-associat/
1938 - Death of Mary Mallon (born in Cookstown, County Tyrone), also known as Typhoid Mary. She was the first person in the United States identified as an asymptomatic carrier of the pathogen associated with typhoid fever