I think its strange when polio and small pox are referenced when both were on a very steady decline long before the vaccine came out. When the vaccine was introduced, both diseases actually had a increase in deaths before the continuing decline. A major increase in living condition and health care (not vaccines, but treatments for the symptoms from the illness) were happening over those years.
Also many people believe that polio still exists, just is named different things when diagnosed. (just to throw that out there but that I haven't really researched to extent) Ok... Bring on the comments
