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Igor Chudov's avatar

==> The mRNA-vaccinated appear to be stuck with their original B Cell pool forever. But it’s ok.

Is that kind of, sort of like original antigenic sin?

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Peter's avatar

We've talked about this before, but this new imprint study does raise the question again why a previous vaccinated individual can produce new B-cells for the nucleus, but not unseen/changed parts of the spike protein.

One important aspect is that N-antibodies typically arrive only after one has cleared the infection. I mentioned this, as what was also left open is the question whether this reshuffle of existing B-cells only occurs if any older antibodies exist. As you have mentioned yourself 'AOS' is not a 'sin' as the old antibodies work fine. So there is also no need to create new ones.

But that would not mean, that if ever a new variant arrives in which the old types are all not effective, the body would not be able to create new B-cells. After all, that would result in large amounts of IgM's for proteins not seen before.

In fact we kind of know for sure that is the case. After all, what has been forgotten from the very early days of covid, is the research in how existing common cold immunity applied to covid. What was seen, is that we humans respond initially by producing large amounts of common cold antibodies, which are mostly non-effective (*). Still we all adapted back then, proving OAS wrong, as peopel infected then created Wuhan1 antibodies.

My guess is that the biochemical feedbacks causing a reshuffle vs produce new B-cells, only react this way when some effective response is mounted. But even then, the N-antibodies prove the body can learn and hence there must be a second factor at play here. I suggested that the changed spike sections may be too small or physically too close on the spikes to produce enough unique IgM's. Or other chemicals part of teh immune response interact here. (**). But I'm just speculating. It would hence be good to see, if truly no new B-cells are created for BA.1 unique proteins, even after a few months. We know also from early 2020 some people produce no antibodies at all, but did produce memory cells after beating covid.

*) There is one against the S2 protein that is, but only a minority of humans produces that. 2-4% in US/France, 10-15% in two African countries. But that is an interesting side issue.

**) The role of CD8 T+ cells is also interesting. Most of them are N-triggered, not spike triggered and may behave different, both in context of repeated infections as well as continuous boosting. This indicates separate learning mechanisms.

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