The "link" is purely illusory. End of story.The attribution of causation, boils down to two factors. First, the MMR vaccine and the onset of autism typically occur at the same stage of development (i.e., early toddlerhood). Second, desperate parents NEED answers. The fact that the timing is similar led them to believe that one caused the other.Fortunately, it is only the timing that the two have in common. The timing of entry into daycare/preschool is also similar. Does this mean that entering preschool leads to the development of autism? Of course not.The moral of the story, is that correlation is NOT the same as causation. Not only is the perpetuation of this myth instilling unfounded fear on the part of some parents, it is actually leading some of them to engage in the dangerous behavior of refusing to vaccinate their children.