That's "untested" except for the 73,000 people who volunteered to participate in the 2 phase III mRNA vaccine trials. And the other extensive research done in phase I and II. 73,000 people who suffered no more side effects or reactions than a typical influenza vaccine. So it's "lethal", outside of the fact that nobody died. But yeah, other than that, "untested and lethal".
So say the vaccine companies who stand to make trillions as long as everyone takes them at their word. I trust nobody at this point.