virus is calling the shots and our health community is working hard to keep up with it...right now it looks like booster shots...if things change dramatically, we'll need a new "formulation" perhaps...see the attached link for more on that.
I'm not sure if you're simply ignorant about all this, or purposefully trying to mess with folks...not that it matters on a message board, but still the fact that you don't educate yourself about something you post so often about is at least 'quizzical'.
Link: https://www.nature.com/articles/d41586-021-00241-6