Originally Posted by
rickair7777
Well, what they said was true before Delta. I assume those sound bites were all before mid-summer.
The RBD is conserved across variants, so far, the Delta difference is simply increased binding probability. The vaccines failed because the antibody levels are both not high enough, and of short duration. Realistically, where Covid is going, it will require many many shots per year to keep antibody levels, which migrate to the respiratory system, high enough for neutralization.