With the Delta variant in play, federal health officials are analyzing the latest numbers to look at the frequency and seriousness of COVID-19 breakthrough infections. Will we need booster shots? And ...

Johnson & Johnson said Wednesday that new data from early trials of a booster shot of its COVID-19 vaccine provides a "rapid and robust increase in spike-binding antibodies" that fight off the virus.

Moderna says it is in the process of developing a single-shot vaccine that could serve as a COVID-19 booster shot and a flu shot. In a press release Thursday touting its fifth annual "R&D Day," ...

CAMBRIDGE, Mass. - Moderna’s COVID-19 vaccine remained 93% effective against symptomatic illness six months after the second dose, but amid the ongoing spread of the highly contagious delta variant, ...

As more Americans receive their COVID-19 vaccination daily, many are wondering how long they'll be effective for and whether some people will require booster shots at some point. Dr. Elizabeth Hudson, ...

WASHINGTON (NewsNation Now) — U.S. health officials Wednesday recommended all Americans get COVID-19 booster shots to shore up their protection amid the surging delta variant and evidence that the ...

LOS ANGELES - The U.S. Food and Drug Administration has authorized an additional COVID-19 booster vaccine for people who have compromised immune systems as the highly contagious delta variant ...