I can answer that for you....but I suspect you already know the answer. It was rejected previously due to adverse reactions. Specifically, when Moderna tried to use the technology to treat a disease called Criggler-Najjar they found that the doses that didn't cause adverse reactions were too low to be effective and doses that were high enough resulted in the technology being rejected. I believe they claim now that the new "coating" works effectively but the few autopsies conducted on those that died from the vaccine showed it present in every organ in the body, including the brain, heart and reproductive organs. I guess we'll eventually find out if their new miracle technology is actually working although I am skeptical. It was supposed to stay in the muscle tissue of the arm but it isn't. It's getting into the bloodstream and doing all kinds of damage. Hopefully not long-lasting damage but it will be years before we know for sure. Their original tests never even got out of the animal trial stage before being rejected. And this all happened in 2017 so unless something miraculous happened in the next two years it may still be an issue.