“Neither the Pfizer nor the Moderna vaccine involved the use of cell lines that originated in fetal tissue taken from the body of an aborted baby at any level of design, development, or production. They are not completely free from any connection to abortion, however, as both Pfizer and Moderna made use of a tainted cell line for one of the confirmatory lab tests of their products. There is thus a connection, but it is relatively remote.
Some are asserting that if a vaccine is connected in any way with tainted cell lines then it is immoral to be vaccinated with them. This is an inaccurate portrayal of Catholic moral teaching.
There are three documents from the Holy See that treat the question of tainted vaccines…
These documents all point to the immorality of using tissue taken from an aborted child for creating cell lines. They also make distinctions in terms of the moral responsibility of the various actors involved, from those involved in designing and producing a vaccine to those receiving the vaccine. Most importantly, they all make clear that, at the level of the recipient, it is morally permissible to accept vaccination when there are no alternatives and there is a serious risk to health.
The Pontifical Academy does call for appropriate expressions of protest against the origins of these vaccines as well as for vigorous efforts to promote the creation of alternatives.”