LOS ANGELES -- U.S. regulators issued new guidance this week shortening the time that people who received Moderna or Pfizer's COVID-19 vaccine have to wait for a booster, and it's different than the ...

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 ...

Some U.S. adults are a step closer to getting updated COVID-19 boosters this fall, as government advisers voted Tuesday that it’s time to tweak shots to better match the most recent virus variants.

Millions of Americans are one step closer to getting a COVID-19 booster shot. The Food and Drug Administration (FDA) amended its emergency use authorization for a Pfizer booster shot Wednesday. It ...