don't conflate primary antibodies with b-cells. You and I aren't walking around with bloodstreams full of anti-measles antibodies, despite being vaccinated in

don't conflate primary antibodies with b-cells. You and I aren't walking around with bloodstreams full of anti-measles antibodies, despite being vaccinated in infancy: but you can bet that you will be if you encounter a bunch of measles in the wild, in relatively short order. The question is: are the covid vaccines like tetanus vaccines or like measles vaccines? So far, the evidence points to the latter, but the desire for a booster anyway is driven by the fact that SARS-CoV-2 is a pandemic; neither tetanus nor measles are.