11-Paralytic Poliomyelitis
It is the most severe case of the disease. About 1 to 2 percent of those infected develop severe muscle pain and stiffness in the neck and back. One in every 200 people with polio (less than 1%) suffers an irreversible paralysis (usually of the legs). Among people with paralysis, between 5 and 10 percent die from the immobilization of the respiratory muscles that cause the virus. Its early symptoms are similar to nonparalytic polio. However, about one week appears other signs of rapid development, such as: