Pioneering in public health.
D002170:Canada; D002771:Cholera / Q000453:epidemiology; D004196:Disease Outbreaks / Q000517:prevention & control; D005513:Food Inspection; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D011634:Public Health / Q000266:history*; D012899:Smallpox / Q000517:prevention & control; D014376:Tuberculosis / Q000517:prevention & control; D014438:Typhus, Epidemic Louse-Borne / Q000453:epidemiology