Post-polio syndrome – Wikipedia

Post-polio syndrome (PPS, poliomyelitis sequelae) is a group of latent symptoms of poliomyelitis (polio), occurring at about a 25–40% rate (latest data greater than 80%). These symptoms are caused by the damaging effects of the viral infection on the nervous system.Symptoms typically occur 15 to 30 years after an initial acute paralytic attack. . Symptoms include decreasing muscular function …

https://en.wikipedia.org/wiki/Post-polio_syndrome