As COVID-19 vaccine manufacturers await U.S. Food and Drug Administration approval on booster shots, millions of fully vaccinated Americans wonder about the next step forward amid the ongoing pandemic ...

You might have fewer antibodies now. But they’re better than the ones you started with. The focus on antibody counts alone actually does a disservice to our understanding of immunity, experts told me.

Two real-world studies published Wednesday confirm that the immune protection offered by two doses of Pfizer’s Covid-19 vaccine drops off after two months or so, although protection against severe ...

In early 2021, Qatar launched a mass immunization campaign with the mRNA-1273 (Moderna) 1 vaccine against coronavirus disease 2019 (Covid-19). 2 We assessed the persistence of real-world vaccine ...

In a recent study posted to the bioRxiv* preprint server, researchers investigated the waning of protective immunity conferred by prior infection by Omicron sub-variants BA.1, BA.2 towards its most ...