I think you get what Rmichael is saying. He is not being literal, either regarding a Prius driver or pig hearts. He is using those as examples to make a point.
He could have said, \"For example: X out of 1000 people have an immune response to silicone\".
Let\'s just pretend he said that since I think that would ease your frustrations with his choice of illustration.
If you did not understand that he was not being literal in his examples, now you know.
If you did understand he was not being literal in his examples, take it the way it was presented.