So it appears to me that the bottom line is that we think more is better but we don't know by how much. I remember the vaccine manufacturers saying early on that a tweak of the formula to handle variants would be easy and quick, but I haven't heard that addressed lately.Since this thead has diverged, here is a good article to read. Second half is of interest.
What Do COVID Antibody Levels Really Mean?
Commercial tests aren't neutralization assays, but some trends are emergingwww.medpagetoday.com