Somewhat off topic, but a fascinating timeline for the development of vaccines.
Did you know that the vaccination for measles wasn't developed until 1963. When I was a kid, when one person in the school got measles, everyone got measles. It was in 1955 when Jonas Salk developed the first effective vaccine for polio. Polio was absolutely the most feared disease and at the time everyone knew at least several persons who suffered, and were in an "iron lung".
As I recall, the only vaccination I received as a small child, was for smallpox.
This website will be well worth your click... if only to to take a minute to spin through the names and dates, from the late 1700's to the many dozens that have come into play in the past decade.
Historic Dates and Events Related to Vaccines and Immunization