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.
Martha May Eliot Martha May Eliot (April 7, 1891 – February 14, 1978), was a foremost pediatrician and specialist in public health, an assistant director for WHO, and an architect of New Deal and postwar programs for maternal and child health. Her first important research, community studies of rickets in New Haven, Connecticut, and Puerto Rico, explored issues at the heart of social medicine. Together with Edwards A. Park, her research established that public health measures (dietary supplementation with vitamin D) could prevent and reverse the early onset of rickets.