https://www.medrxiv.org/content/10.1101/2023.06.09.23290893v1.full.pdf
Risk of Coronavirus Disease 2019 (COVID-19) among Those Up-to-Date and Not
Up-to-Date on COVID-19 Vaccination
Summary: Among 48 344 working-aged Cleveland Clinic employees, those not “up-to-date” on COVID-
19 vaccination had a lower risk of COVID-19 than those “up-to-date”. The current CDC definition
provides a meaningless classification of risk of COVID-19 in the adult population.
The reason this is happening is due to the effect: Antibody Dependent Enhancement (ADE).
The more boosters one takes, the more enhanced the virus' ability to enter cells becomes (the exact opposite of what you want).
https://pubmed.ncbi.nlm.nih.gov/32908214/
(note: Antibody-dependent enhancement, sometimes less precisely called immune enhancement or disease enhancement, is a phenomenon in which binding of a virus to sub-optimal antibodies enhances its entry into host cells, followed by its replication. The sub-optimal antibodies can result from natural infection or from vaccination.)