As a baby boomer, I have an observation to this statement. Never had mumps, so I can't comment. But, I did have measles and chicken pox. Where did it come from exactly if not from vaccines. We are a family of 6 children in addition to mom and dad. When one of the 6 caught measles or chicken pox, mom made sure we all became exposed so we could all catch and be over the disease at the same time - beyond genius to me...then add in all of the cousins because we were a big family. But guess what - despite their exposure neither of my parents ever caught the measles or chicken pox - nor did either one ever encounter shingles (a late in life by product/reactivation of chicken pox) in their old age.