Multiple doses of the Pfizer or Moderna COVID-19 vaccines lead to higher levels of antibodies called IgG4, which can provide a protective effect. But a growing body of evidence indicates that the “abnormally high levels” of the immunoglobulin subclass actually make the immune system more susceptible to the COVID-19 spike protein in the vaccines, researchers said in the paper.

They pointed to experiments performed on mice that found multiple boosters on top of the initial COVID-19 vaccination “significantly decreased” protection against both the Delta and Omicron virus variants and testing that found a spike in IgG4 levels after repeat Pfizer vaccination, suggesting immune exhaustion.

Studies have detected higher levels of IgG4 in people who died with COVID-19 when compared to those who recovered and linked the levels with another known determinant of COVID-19-related mortality, the researchers also noted.

A review of the literature also showed that vaccines against HIV, malaria, and pertussis also induce the production of IgG4.

“In sum, COVID-19 epidemiological studies cited in our work plus the failure of HIV, Malaria, and Pertussis vaccines constitute irrefutable evidence demonstrating that an increase in IgG4 levels impairs immune responses,” Alberto Rubio Casillas, a researcher with the biology laboratory at the University of Guadalajara in Mexico and one of the authors of the new paper, told The Epoch Times via email.

The paper was published by the journal Vaccines in May.

source zerohedge.com