Dr. Barry has videos on this. Thanks for posting.
I should have added that while my partner has had 4 mRNA shots, my 2 Covid shots in 2021 were for J&J. However, since I am told J&J also focuses on the SPIKE protein, I think Spike might be the cause of IgG 1 thru 4 immune alterations, rather than the mRNA factor. Since J&J was not included in the small study that brought attention to the IgG immune system change issue, this also needs to be looked at in a larger study.