There's not going to be one vaccine to rule them all (with the current tech). Covid, just like the flu, is widely distributed and mutates quickly. The boosters every year target specific strains that they think will be prominent during high season (now).

Every year, expect new boosters that target different strains from the previous year. The viruses evolve, and so must the vaccines.

[–] MedicPigBabySaver -2 points 10 months ago

Yeah, I grasp the concept. Just like the flu shot being a gamble of which strain will be most prevalent.

I know Moderna is in clinical trials for a one shot combo.

As you can read... I'm just not convinced I need another booster. You should be glad I'm 4 deep. There are millions at zero or 2.