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1.Why Mary Mallon was nicknamed as typhoid Mary?(Mark 1) 2. How a healthy person is infected by Typhoid fever?
Mary Mallonwas the first person in the United States to be identified as a healthy carrier of typhoid fever. Over the course of her career as a cook, she is known to have infected 53 people, 23 of whom died from the disease.Healthy person is by typhoid by consuming unhygeinic which is contaminated by Salmonella typhi
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