Poliomyelitis Symptoms and Causes
Poliomyelitis is a highly contagious infectious disease caused by three types of poliovirus. The poliovirus is a virus most recognized for its destruction to the nervous system, causing paralysis. The majority of individuals who are infected with polio, however, have no symptoms and a few have mild symptoms. Of those persons who do acquire the infection, 1 percent or fewer may develop paralytic disease. Since the introduction of the polio vaccine in 1955, infections from the poliovirus have nearly been eradicated.