The world's first vaccine against a parasitic infection

In the late 1950s George Urquhart, William Mulligan, Frank Jennings, William Jarrett and Ian McIntyre, all members of staff at the Glasgow Veterinary School, developed the world's first vaccine against a parasitic infection in either humans or animals -- known as the Dictol Group, the five developed a vaccine against the lung worm parasite in cattle, which was a significant problem for farmers.