Yeah, I wasn't being too clear. What I'm asking, since I'm not that knowledgeable about vaccines, particularly novel ones, is whether or not the booster shot is made up just of the same mRNA nanoparticles - just fewer of them - or is there some other difference. BTW, the rather rapid buildup figures I heard were, I think, on NPR. I've been unable to find them again. However, IIRC, the buildup of immunity was noticeable by ten days and was 90% complete by the booster. I was startled, TBF. I think they based it on antibody counts. I'll keep looking...