Polio(Poliomyelitis)
Poliomyelitis, commonly called polio, is an infectious disease. It is caused by 1 of 3 types of poliovirus. Polio is easily spread from person to person. The poliovirus is a virus that can cause paralysis. But, most people who are infected with polio have no symptoms and a few have mild symptoms. Very few people who get polio develop paralysis. Since the polio vaccine was invented in 1955, polio has been nearly stamped out. Up to now, there have been no known cases of polio since 1979.

Poor and developing countries may not have access to the vaccine. Polio is still a concern in these areas, especially for infants and children.