'Imagine that you are a six-year-old child. One day, you get a sore throat and a headache and start to feel generally icky. Your parents put you to bed. You don’t get better. Within a few days, you cannot move your legs and your back has begun to curve. You have caught an infectious disease known as poliomyelitis or infantile paralysis. It is a virus that attacks mainly children. There is no known cure. You might die. If you survive, you will spend the rest of your life as a cripple, able to walk only with your legs strapped into contraptions of steel and leather. You will be the child, the one that every primary school has, who clumps around in callipers, unable to run and skip and join in the other children’s games. Worst of all, you will become an object of pity.' (Introduction)