Mary Mallon, known as Typhoid Mary, is remembered in medicine because she

1. A carrier harbours a pathogen and transmits it without showing the disease. 2. Mary Mallon was a cook by profession and a typhoid carrier. 3. She continued to spread typhoid for several years through the food she prepared. 4. The case is the classic teaching example of why food handlers are screened. 5. She neither isolated the organism nor developed any test or vaccine. _Source: syllabus Biology Ch7 'Human Health and Disease', section 7.1_