Final answer:
Typhoid Mary, real name Mary Mallon, was confirmed to be a healthy carrier of Typhoid Fever; she was asymptomatic but linked to multiple typhoid cases by epidemiologists.
Step-by-step explanation:
We are certain that Typhoid Mary was a healthy carrier of Typhoid Fever because of historical accounts and medical investigations. Mary Mallon, an Irish immigrant who worked as a cook in New York in the early 20th century, was identified as a carrier of Salmonella enterica serovar Typhi, the bacterium that causes typhoid fever. She was an asymptomatic carrier, which means she carried the bacteria without showing symptoms herself. Her case became infamously known through the work of George Soper, an expert in typhoid fever epidemics, who traced multiple cases of typhoid back to Mallon. Despite never being ill herself, epidemiologists linked her to 51 cases of typhoid fever and three deaths. The Typhoid Mary case underscores the importance of understanding asymptomatic carriers in the spread of infectious diseases.