If you are concerned about challenges to your COVID vaccine religious exemption over the previous use of products / medicines that were developed or tested using aborted fetal cell lines, then you need to read this article from an Orthodox physician.
"But what about CHOICE? Do bioethics not support choice? Where are these ethics when society allows a woman to choose between keeping or aborting her baby but does not allow a consumer to choose whether or not the product he/she consumes is derived from the cells of that aborted baby? Is this lack of choice ethical? It is absolutely NOT ethical, which is why I fully expected Dr. Nash, in his podcast, to describe how he, as a prominent bioethicist who self-identifies as Orthodox, was working towards advocating for that CHOICE. Even God gives us choices between good and evil and every grey area in between. How can we claim to live in a free society when the use of aborted fetal cell lines has become so systemic, thanks in part to the concealment of their use for so long, that when it comes down to choosing an ethically sourced drug, there is no choice?"
https://orthodoxreflections.com/the-aborted-bioethics-of-ancient-faith-radios-fr-john-parker-dr-ryan-sampson-nash/