Isn't Polio Already Eradicated?

No.  We don't hear about it in North American because our kids are vaccinated against it at a very early age and it has not existing in the while since the early 1960's except for a small outbreak in 1973.

Vaccinating our kids and not seeing the disease is not the same as eradicating it.  With global travel today, the disease is only an 8 hour plane ride away.  If our population was not vaccinated, it would return quickly and spread like wild fire across the continent.

If you don't know anything about Polio, be thankful that the vaccines have worked as well as they do.