Let's just be really clear here. No "stem cells" were used either in the production or testing of our current vaccines. The cells that WERE used are thousands of generations down the line from the original stem cells and were not obtained from aborted foetuses. Now we know how they originated, and it's down to each one of us to make a moral judgement for ourselves. But we should take into account the fact that the vaccines are going to save hundreds of thousands of lives. To coin a cliche, we are where we are, and even the Vatican, reluctantly I'm sure, recognises that.