
She developed typhoid in 1900 and from then on infected around 50 people, three of them fatally. It is believed that she emigrated to America at the age of 15 where she found work firstly as a maid, then as a cook. Mallon had the misfortune to be one of these healthy carriers. However, an individual can be a healthy carrier, completely asymptomatic and unaware of their condition. Symptoms include fever, headaches and diarrhoea and, if left untreated, it can lead to full septicaemia and death. It is transmitted through ingestion of contaminated food or water.

Typhoid is a disease caused by the bacteria Salmonella typhi.

Her story, and experience of the state’s early approaches to dealing with ‘healthy carriers’, continues to divide opinion. Mary Mallon, famously known as Typhoid Mary for the infection she carried and spread, was born in Cookstown, Co.
