I was not talking about polio-which was not considered completely eradicated in some areas of the US until the late 70’s-I’m pretty sure everyone is well acquainted with the effects of that disease-and we certainly can’t equate it with measles-they are apples and oranges.
I was talking about things like diphtheria, typhoid, yellow fever-already eradicated in the US-and a host of tropical diseases we never had here. There are/were military bases all over the world, and if you were going to one of them in a country where those diseases still infected people, you most assuredly would be exposed.
No civilian would unless they were going to that country for a stay-a civilian in the US had just about zero chance of exposure to that stuff unless they were exposed abroad.