We have a built-in immunity cycle the Lord gave us, he wasn't stupid, he knew what he was doing. It's a slow cycle, and some will die, but making a vaccine to jump-street against the Lysogenic Cycle will and does have side effects along with the consequences of death tied to it. Now attempting to play with the genome or mRNA (recipes) the DNA delivers for cell nutrition will destroy your cells, and that's a no ifs or butts, it will shorten your life-span.