Symptoms of Polio
Less than 1 percent of polio cases will result in paralysis. In these severe cases, symptoms begin with:
- Muscle aches
- Loss of reflexes
- Other "minor illness" symptoms.
These early symptoms improve after several days. However, 5 to 10 days later, the fever returns and paralysis begins. Paralysis progresses for two to three days. Once the temperature returns to normal, there is usually no further paralysis. Along with paralysis, other symptoms with paralytic poliomyelitis can include painful muscle cramps and muscle twitching.
The risk of paralysis with polio increases with age. In children under the age of five, paralysis of one leg is common. In adults, paralysis of both arms and legs is common. The muscles that control urination and breathing may also be affected.
Many people with paralytic poliomyelitis recover completely, and muscle function returns to some degree. However, paralysis after six months is usually permanent.
Complications of Polio
People who develop serious symptoms of polio (include paralysis) may experience complications. Complications in severe cases can include:
About 2 to 5 percent of children and 15 to 30 percent of adults with paralytic polio die from the poliovirus infection.