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We present five case reports to illustrate the late effects of acute paralytic poliomyelitis occurring many years after recovery. We emphasize the importance of ruling out common medical causes for the symptoms and address the question of a "postpolio syndrome." The cause of progressive muscle weakness 30 to 40 years after recovery from poliomyelitis remains unknown.
Wiechers et al. (1985) studied this question. Acute paralytic poliomyelitis can result in progressive muscle weakness 30 to 40 years after recovery, a late effect of unknown etiology often termed postpolio syndrome.