Last I checked, the development of the vaccines by Moderna and Pfizer do not necessarily require the tissue cells from aborted fetuses, at least this is what I've been reading. However that does not mean that the companies have never used such tissue samples before....they very likely have.
Why then, for years, has an mRNA vaccine been denied for use in human trials? Now suddenly its ok? Remember when Project Veritas exposed Planned Parenthood years ago for selling organs and tissue? That never got stopped....oh sure plenty of outrage, but it's still happening. I guess now we know who some of their biggest customers are and those same pharmaceutical companies' lobbyists made sure nothing stopped them from getting what they wanted.
But again, if I'm completely wrong about this and it's been conclusively proven that no cells from fetal tissue have ever been used in the development or manufacture of any of these covid vaccines, then please tell me.
They couldn't make mRNA vaccines' work before they learned to "wrap" the RNA strand in nanoparticles to evade being destroyed by the body.
As to whether any fetal tissue or cells were used in it's development is anyone's guess, but that would be true for nearly all medical research in the past few decades at some point along the line, particularly in cancer research and other fields.