This thread is very old, but since the question came up here: Someone who dies of Polio chokes. Polio paralyses and so you cannot breath while you are complete awake.
Perhaps you remember that in times when polio was still a big theme people who survived had to spend the rest of their lifes in an 'iron lung' which helped their paralysed breast to 'get up and down' and so to get air into the lungs. A cruel dead which this child had to go through, and the words of his father 'I am happy my wife passed away before so she did not have to see it' say enough.
It is not out of the world, we all should remember to refresh our oral vaccination.