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The famed "Typhoid Mary" infected more than 50 people by cooking for them:

"Typhoid Mary" was a real historical person who became notorious in the early 1900s. She was an Irish woman named Mary Mallon who immigrated to the United States in the 1880s. Though she had no symptoms of typhoid fever, she carried the bacteria in her blood and could pass it on to other people. Because no doctor could convince her that this was true and she didn't feel sick, she insisted on working as a cook. During her career, she infected at least 51 people, three of whom died, before she was isolated in enforced quarantine for the last decades of her life.