CDC: 60% of U.S. is fully vaccinated

• Yes, but: Walensky noted that the Delta variant is still the dominant strain in the U.S.

By the numbers: Approximately 71% of the U.S. population has received at least one vaccine dose, and around 23% have had a booster shot.

• Some 64% of those over 5 years old are fully vaccinated. That number is around 72% for all adults.

What they're saying: "While we are still working to understand the severity of Omicron, as well as how it responds to therapeutics and vaccines, we anticipate that all of the same measures will at least in part provide some protection against Omicron," Walensky said.

"So if you are not vaccinated, this means getting vaccinated. If you are eligible to be boosted, and you are not yet boosted, this also means getting boosted, along with wearing a mask in indoor public settings, frequently washing your hands, improving ventilation, physical distancing and increased testing to slow transmission of this virus."