At some point, there will be no benefit from incessant boosting. Vaccines don’t max out at 100% effectiveness.

There are millions who need first doses. With exceptions for immunocompromised, there are none—based on any data we have—who need fourth doses within this time frame. https://t.co/co30TPmDlZ

— Dr. Angela Rasmussen (@angie_rasmussen) September 14, 2021