At this point a feeling of extreme unease might overcome the Catholic who is attempting to assess the morality of this procedure. He recognizes that the moral object of the act is good – to immunize a child against these diseases - and he recognizes that if all the attending circumstances were good, he could safely conclude that this act would be good. But now he reaches the uneasy notion that this vaccine is tainted in some fashion, since it was produced using fetal tissue. May he then use it – since he is not directly approving of the abortion which made production of this vaccine possible? He wonders, does this circumstance "by what aid" pertain here? Can he disclaim the origin of this vaccine, as some have argued, on the basis that his use would only be a remote material cooperation with the intrinsic evil of the direct abortion and use of the aborted baby's tissue?
The Morality of using Vaccines derived from Fetal Tissue Cultures
Fr. Phil Wolfe, FSSP has provided a few consideration on The Morality of using Vaccines derived from Fetal Tissue Cultures. Here is a short clip from the article. Please read the rest on the Children of God for Life website.