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Mallon, commonly known as 'Typhoid Mary,' was an asymptomatic carrier of Salmonella typhi. She unknowingly spread typhoid fever through her work as a cook in the early 1900s.
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Salmonella typhi: A bacterium that causes typhoid fever, transmitted through contaminated food and water.
Asymptomatic Carrier: An individual who harbors a pathogen but shows no symptoms, yet can still spread the disease.
Quarantine: A period of isolation imposed on individuals or groups to prevent the spread of infectious diseases.