CDC change Polio risk on their website
September 27, 2012:
https://web.archive.org/web/20120927...short-both.htm
Approximately 95% of persons infected with polio will have no symptoms. About 4-8% of infected persons have minor symptoms, such as fever, fatigue, nausea, headache, flu-like symptoms, stiffness in the neck and back, and pain in the limbs, which often resolve completely. Fewer than 1% of polio cases result in permanent paralysis of the limbs (usually the legs). Of those paralyzed, 5-10% die when the paralysis strikes the respiratory muscles. The death rate increases with increasing age.
August 12, 2014:
https://web.archive.org/web/20140812...short-both.htm
Approximately 72% of persons infected with polio will have no symptoms. About 24% of infected persons have minor symptoms, such as fever, fatigue, nausea, headache, flu-like symptoms, stiffness in the neck and back, and pain in the limbs, which often resolve completely. Fewer than 1% of polio cases result in permanent paralysis of the limbs (usually the legs). Of those paralyzed, 5-10% die when the paralysis strikes the respiratory muscles. The death rate increases with increasing age.
By June 14, 2017, there's no mention of the statistics:
https://web.archive.org/web/20170614...-in-short.html