According to a study titled "IgG4 Antibodies Induced by Repeated Vaccination May Generate Immune Tolerance to the SARS-CoV-2 Spike Protein," it has been found that IgG4 levels increase with repeated administration of mRNA vaccines.
A peer-reviewed study entitled “IgG4 Antibodies Induced by Repeated Vaccination May Generate Immune Tolerance to the SARS-CoV-2 Spike Protein” reports, “recent investigations have found abnormally high levels of IgG4 in people who were administered two or more inj...
