European Medicines Agency Warns Frequent Covid-19 Booster Shots May Adversely Affect Immune System

"If we have a strategy in which we give boosters every four months approximately, we will end up potentially having problems with the immune response, and the immune response may end up not being as good as we like it to be.

So we should be careful in not overloading the immune system with repeated immunization, and secondly, of course, there is the risk of fatiguing the population with the continuous administration of boosters."