Scientists at the University of North Carolina have confirmed that effective protection against the SARS-CoV-2 coronavirus is short-lived. The results of the study are published in the journal Proceedings of the National Academy of Sciences (PNAS).

It is known that the risk of breakthrough infections, in which a person becomes infected despite vaccination, depends on the type of vaccine. Current mRNA vaccines (Pfizer, Moderna) provide the longest duration of protection, nearly three times the duration of the immune response after natural infection, as well as after the Johnson & Johnson and Oxford-AstraZeneca vaccines.

According to the authors of the article, mRNA vaccines provide the highest level of antibodies, which is associated with more reliable protection. However, for a long-term effect against COVID-19, additional stimulation with booster doses of vaccines is required, which promotes antibody responses to new strains of coronavirus that appear during natural evolution over time.

https://dx.doi.org/10.1073/pnas.2204336119

They just don't want to tell you that each new booster makes huge hit on immune system and depletes its reserves.