It is an article of faith among the antivaccine movement that vaccines are degrading the health of our children, such that vaccines cause autism, asthma, diabetes, and a number of other chronic diseases. You won't have to look far on most antivaccine websites to find claims that today's children are the sickest in history and insinuations, if not outright statements, that vaccines are at least part ofthe cause. If you've been following the antivaccine movement as long as I have (more than a decade) or even if you've only been following it one tenth as long, you are probably aware that one of…