Wild polio is extinct. The only polio any more is caused by the vaccine.

#9 | Posted by john_savage1

No, it's not. Otherwise, the eradication project would be declared successful.

There are a few dozen wild polio cases a year in places like Pakistan and Afghanistan.

For those ragging on his statement, he's correct about the vaccine caused polio. In many places, the live attenuated poliovirus vaccine is used because of easier logistical considerations and induction of more complete immunity. An unfortunate side effect is that vaccinated people will shed virus for weeks after vaccination and it reverts to wildtype Poliovirus Type II, which can cause disease in people who are unvaccinated or who had a poor response to the vaccine.