What is IgG4 antibody and why would it rise almost 4000% after covid vaccination?

Irrgang, Pascal, et al. "Class switch towards non-inflammatory, spike-specific IgG4 antibodies after repeated SARS-CoV-2 mRNA vaccination." Science immunology (2022): eade2798.
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Timecodes
0:00 Intro
0:10 Discussion on the significance of IgG4 increase after COVID-19 vaccination.
4:38 Role of different types of antibodies in immune response to viruses explained.
9:14 Significance of IgG4 level rise in COVID-19 and its potential implications on virus circulation.

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