Kids Who Received mRNA COVID Vaccines Had Altered Immune Systems a Year Later

Children ages 5-11 who received two doses of Pfizer’s mRNA COVID-19 vaccine had heightened levels of a type of antibody suggestive of an altered immune system response one year after vaccination, a new peer-reviewed study revealed.

The team of German researchers, led by Dr. Robin Kobbe with the Institute for Infection Research and Vaccine Development at the University Medical Center Hamburg-Eppendorf in Germany, looked at blood samples of 14 healthy children the day the children received dose one of Pfizer’s shot, one month afterward and one year after the children received dose two.

A year after the second dose, they found increased levels of IgG4 antibodies in the children’s blood, suggesting that their immune system switched its type of immune system response.

IgG4 is one of the four subclasses of immunoglobin, or antibodies, produced by plasma cells in the blood.