I will not attempt to pick apart the science here; other have done that far better than I ever could. My discomfort with the praise Dr. Deisher's work has received from lay (meaning non-scientist) Catholics is not about the science, which I'm hardly qualified to speak about. It's rather about what I consider to be a disturbing moral and theological fallacy implicit in Deisher's work. Keep in mind that I'm about as much a moral theologian as I am a scientist; but, as we all know, having zero credentials has never been a deterrent to expressing one's opinion on the Catholic blogosphere, or anywhere else, for that matter.
I believe Dr. Deisher's work is based on a faulty theological premise, because it assumes autism to be the logical outcome of cooperation with intrinsic evil. The flaws in Deisher's assumption are twofold:
1. She subtly portrays autism as an evil outcome -- a thing to be feared; and
2. She ignores the revelation of Christ in the New Testament. I will address this flaw first.
The basis of Deisher's research is the fact that the rubella vaccine was derived from a fetal cell line taken from an aborted baby more than fifty years ago; ergo, cooperation with the evil of abortion, no matter how remote, will lead to a bad outcome. This is the doctrine of karma, which is not a teaching of our church.
Deisher appears to have based her assumption on Exodus 34:6-7 and other passages in the Old Testament, which caution that God "visits the iniquity of the fathers on the children and the children's children, to the third and fourth generation." (Since today's infant vaccinands are roughly the third generation from that aborted baby, perhaps this means that the evil power of the rubella vaccine will have worn off by the time their own children are born, and that no one, in that happy time, will need Fear The Autism.)
While it is true, of course, that sin, beginning with Original Sin, has ruined the world, we now have a Savior who is merciful and just; even the prophets of the Old Testament offer a perspective on sin and forgiveness that differs from the one in Exodus. Ezekiel, for example, say that