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The result is some recovery of movement and the development of enlarged motor units.
Most hospitals in the 1950s had limited access to for patients unable to breathe without mechanical assistance.
It may also be spread by food or water containing human feces and less commonly from infected.
The virus enters the central nervous system in about 1 percent of infections.
The processes involved in recovery following acute paralytic poliomyelitis are quite effective; muscles are able to retain normal strength even if half the original motor neurons have been lost.