Boosters will likely protect people through the current Omicron surge, Moderna's Stephane Bancel said. But their efficacy will probably wane in the months ahead.
Vaccine protection held up against hospitalization, but waned after the second dose, per UK government figures. A booster raised the protection again.
Cases are up 60 percent from the previous week, driven by Omicron, but hospitalizations have only gone up 14%. However, these tend to lag behind.
Around 200,000 appointments for a booster shot have been made available over Christmas Eve, Christmas Day, and Boxing Day.
Experts said boosters should still provide protection against hospitalization and death from COVID-19 caused by Omicron.
After largely holding off from touting Operation Warp Speed since leaving office, Trump is urging his supporters to "take credit" for the vaccine.
Moderna shared new data which shows that a 50 microgram dose of its booster vaccine increases the level of neutralizing antibodies 37-fold.
"As cases increase across the country, I urge everyone who has not already done so to get the vaccine and the booster," Warren said.
Dr. Francis Collins spoke with CBS's "Face the Nation" on Sunday morning and said those traveling this winter "should do so very carefully."
Two shots of J&J's vaccine yields fewer side effects than three shots of Pfizer or Moderna, new CDC data shows.
Omicron seems better at dodging antibodies from two doses of vaccine. But vaccines could still protect against severe disease, say experts.
Moderna has outlined its strategy to address the new coronavirus variant Omicron. BioNTech-Pfizer and Johnson & Johnson are testing the effectiveness of their vaccines.
Immunity is waning among those who received COVID-19 shots more than six months ago. The news comes as boosters were authorized for all US adults.
Immunocompromised adults who had Pfizer or Moderna's two-dose COVID-19 vaccines, plus an additional shot, can now get a fourth, the CDC said.
The FDA has approved mix-and-match boosters, allowing fully vaccinated people to get an extra dose of a different COVID-19 vaccine. Here's why.
Fully vaccinated people who previously caught COVID-19 had "won the game" and likely had strong immune protection already, one vaccine expert said.
J&J announced Tuesday that it has submitted data to the FDA and asked the agency to authorize booster shots.