well, what evidence would satisfy depends on the person. since i am not aware of decent peer reviewed studies that answer the question either way, this falls into a grey area of who do you trust. the system with billions of dollars at stake? parents with injured kids? your own instincts? all of the above? no easy answer if you see what I mean. I trust logical reasoning and the flawed Science behind the germ theory to know that vaccines are not what they are made out to be, and certianly can't deliver good health.