ABSTRACT The coronavirus disease 2019 pandemic persisted for 3 years and is now transitioning to endemicity. We illustrated the change in group immunity induced by vaccination (monovalent vaccines) and breakthrough infections (BIs) in a healthcare worker (HCW) cohort. Five sampling points were analyzed: before the third dose and 1. 3. https://www.ashleyshomestores.shop/product-category/chairs-w-cush-table-set-3-cn/