He subscribed to the fairly new germ theory of disease previously, contagious illness was thought to emanate from the filthy air given off by garbage and was associated with poverty and dirty living conditions. George Soper, a sanitary engineer, to investigate the source of the illness. Mary, who was later described as not very fastidious about hand-washing, spread the disease by handling food. Unfortunately, one or more people in her employers' houses invariably came down with typhoid, a fever caused by bacteria in feces. She became known as a talented cook and worked for a number of wealthy clients. Mary Mallon came to New York from Ireland as a teenager in 1884 and, like so many immigrants, found work as a domestic servant in the houses of well-off families.
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