Mary Mallon (September 23, 1869 – November 11, 1938), better known as Typhoid Mary, was a woman who was identified as a carrier of typhus and has been identified as patient zero of several outbreaks. Mary was employed as a cook which resulted in her spreading the bacteria. She is considered responsible for the infection of at least 51 individuals and the deaths of at least 3.[1] Despite this, Mary was found to be immune to the bacteria, making her a carrier for the disease. She was forcibly quarantined twice due to her refusal to maintain hygiene while preparing food.