With the delta variant now dominant in the United States, study results highlight the need for officials to do everything they can to increase vaccine uptake. As the United States grapples with a ...

Pfizer announced on Thursday that its COVID vaccine booster shot could further protect individuals from "all currently known variants" of COVID-19 — including the highly transmittable Delta variant.

The beauty of mRNA vaccines is their ability to be quickly updated. Though the vaccine makers are confident in their original vaccines, as COVID-19 continues to change, the vaccines can change, too.

Pfizer Inc. and COVID-19 vaccine partner BioNTech said late Thursday they are developing a booster shot specifically targeting the so-called delta variant of the virus that causes the disease. The ...