Polio is a disease that can lead to lifelong problems of mobility, or even to paralysis. Franklin roosevelt, an american president, contracted poly at the age of 39. By the 19 fifties, a vaccine had been developed. It was a huge successsotaeaeese to besi reveti poleo, a global vaccination programme largely eradicated the disease. Continued progress in the battle against polio is signalled with the start of large scale tests of a new vaccine.