I think that is the case with polio and smallpox, which means they weren't eliminated because they were easy, but because they were awful.
We can draw lessons and encouragement from the histories of polio and smallpox, on several counts.
If the smallpox and polio successes were achieved in a low-tech world, think how much more we can accomplish with vastly improved tools, infrastructure, and communication.
Dialysis came a few years later, then chemotherapy, then the defibrillator, then the polio vaccine; then came cloning, then a kidney transplant.
Their veracity was impeached in ancient times by Asinius Polio and has often been called in question by modern critics.
During his campaign and his time in office, the extent of the effect of his polio was kept from the public, but the fact he had the disease was commonly known.
By 1910, polio spread dramatically around the world, paralyzing thousands each year.
Nonetheless, in 1952, 58,000 new cases of polio were in the United States, the most there would ever be.
In addition, images engraved in walls of what appear to be people infected with polio are found in Egypt dating back to at least 1400 BC.
With a grant from the National Foundation for Infant Paralysis, he went to work on a polio vaccine.