A new peer-reviewed paper has troubling news for anyone who has received multiple mRNA shots, suggesting the immune system paradoxically weakens a crucial part of its Covid response after the third jab.
The immune shift causes the body to make relatively more of a less potent kind of antibody to Covid, displacing antibodies that attack the virus more aggressively.
The change could heighten the risk of Covid infection and mean that people who are infected suffer longer and more serious cases.
It may also increase the chance of certain autoimmune disorders, though that connection is more speculative.
Worse, the researchers found evidence that being infected with Sars-Cov-2 after receiving a booster worsens rather than reverses the shift.