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