Repeated mRNA Vaccination May Hamper Recovery From COVID-19: Study

There is also a risk of autoimmune disorders and inflammatory diseases following repeated COVID shots.

Five doses of Pfizer's Covid-19 vaccine that received emergency use authorization are ready for distribution at George Washington University Hospital in Washington on Dec. 14, 2020. JACQUELYN MARTIN/POOL/AFP via Getty Images

Taking multiple mRNA vaccines can end up raising the levels of a specific antibody that is linked to a reduced capacity of the immune system and “poor clinical outcomes of COVID-19,” according to recent research.

The preprint study, published in MedRxiv on Jan. 18, looked at the effects of Moderna and Pfizer mRNA COVID-19 vaccines as well as Novavax COVID-19 shots on IgG4 antibody levels in the human body.