Poliomyelitis, commonly shortened to polio, is an infectious disease caused by the poliovirus.[1] In about 0.5 percent of cases, it moves from the gut to affect the central nervous system, and there is muscle weakness resulting in a flaccid paralysis.[1] This can occur over a few hours to a few days.[1][3] The weakness most often involves the legs, but may less commonly involve the muscles of the head, neck, and diaphragm.[1] Many people fully recover.[1] In those with muscle weakness, about 2 to 5 percent of children and 15 to 30 percent of adults die.[1] Up to 70 percent of those infected have no symptoms.[1] Another 25 percent of people have minor symptoms such as fever and a sore throat, and up to 5 percent have headache, neck stiffness, and pains in the arms and legs.[1][3] These people are usually back to normal within one or two weeks.[1] Years after recovery, post-polio syndrome may occur, with a slow development of muscle weakness similar to that which the person had during the initial infection.[2]
https://en.wikipedia.org/wiki/Polio
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