The Centers for Disease Control and Prevention will not update its definition of “fully vaccinated” to include booster shots, but will instead only consider Americans “up to date” with their Covid-19 ...

Covid booster shots are "optimal care" as the deadly virus continues to mutate and spread, but the U.S. government is staying firm for the time being on the definition of fully vaccinated, top U.S.

In a recent study posted to the medRxiv* preprint server, researchers investigated the immunological mechanisms behind the decreasing efficacy of coronavirus disease 2019 (COVID-19) vaccines by ...

While U.S. health officials recommend all adults get their COVID-19 booster shots, they’re not currently required to be considered fully vaccinated. However, that could change in the future as more ...

Can you be fully vaccinated against Covid-19 when you board an airplane but no longer so when you disembark? The answer is yes, and it doesn’t involve the Quantum Realm or a time machine made out of a ...

The Ad26.COV2.S vaccine, which was approved as a single-shot immunization regimen, has been shown to be effective against severe coronavirus disease 2019. However, this vaccine induces lower severe ...

Waning immunity after messenger RNA (mRNA) vaccination and the emergence of variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have led to reduced mRNA vaccine efficacy against ...

Despite encouraging Americans to get coronavirus vaccine booster shots, White House coronavirus coordinator Jeff Zients on Jan. 5 said the Biden administration was not changing the definition of fully ...