Sara Josephine Baker was an American physician notable for making contributions to public health, known for twice tracking down which infamous index case better known as Typhoid Mary,  the first person in the United States identified as an asymptomatic carrier of the pathogen associated with typhoid fever, her name?
Mary Mallon Mary Mallon (September 23, 1869 – November 11, 1938), better known as Typhoid Mary, was the first person in the United States identified as an asymptomatic carrier of the pathogen associated with typhoid fever. She was presumed to have infected 51 people, three of whom died, over the course of her career as a cook. She was twice forcibly isolated by public health authorities and died after a total of nearly three decades in isolation.
USS Mercy (AH-4) USS "Mercy" (ID-1305/AH-4) was a hospital ship in the United States Navy during World War I. She was the first U.S. Navy ship of that name. The ship was previously known as SS "Saratoga, a steamer for the Ward Line on the New York to Havana route, and considered the fastest steamship in coastal trade. Before being purchased by the Navy, the ship was briefly employed as United States Army transport ship USAT "Saratoga, a career that ended after a collision off Staten Island, New York.