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?
Sara Josephine Baker Sara Josephine Baker (November 15, 1873 – February 22, 1945) was an American physician notable for making contributions to public health, especially in the immigrant communities of New York City. Her fight against the damage that widespread urban poverty and ignorance caused to children, especially newborns, is perhaps her most lasting legacy. In 1917, she noted that babies born in the United States faced a higher mortality rate than soldiers fighting in World War I, drawing a great deal of attention to her cause. She also is known for (twice) tracking down Mary Mallon, the infamous index case known as Typhoid Mary.
Francis Weld Peabody Francis Weld Peabody (1881–1927) was an American physician born November 24, 1881, in Cambridge, Massachusetts. He was famous for his extensive research into poliomyelitis and typhoid, as well as being one of the most quoted teachers at Harvard Medical School. His father, Francis Greenwood Peabody, (1847–1936) was a Harvard graduate and minister.