Fauci: Boosters could see COVID reach endemic level in U.S. next year

• And Fauci expressed concern in a prerecorded interview aired at the summit Tuesday afternoon that the U.S. could face a surge in cases this winter, driven by unvaccinated people and waning vaccine immunity, per ABC News.

By the numbers: 70.6% of adults have been fully vaccinated against the virus in the U.S., according to the CDC.

• The U.S. confirmed an average of almost 83,500 new COVID-19 cases each day over the past week, up 14% on the previous week, according to CNBC analysis of Johns Hopkins University data.
• Fauci told CNBC infection numbers may need to fall to 3,300 a day in order for the U.S. to gain control over the coronavirus.

Threat level: "Obviously the people who are most vulnerable are the unvaccinated," Fauci said, according to ABC News.

• "But when you have a virus as transmissible as Delta, in the context of waning immunity, that dynamic is going to negatively impact even the vaccinated people."

State of play: Federal regulators currently allow boosters only for people age 65 and older, those with pre-existing conditions and those who live or work in high-risk facilities.

• California, Colorado, New Mexico and New York City have expanded COVID-19 booster access to all adults ahead of federal recommendations.

What to watch: The Biden administration is expected to begin the process of expanding the booster authorization to all adults as early as this week, Axios' Caitlin Owens reports.

The bottom line: "Look what other countries are doing now about adopting a booster campaign virtually for everybody," Fauci noted to Reuters.

• "I think if we do that, and we do it in earnest, I think by the spring we can have pretty good control of this ... endemicity means a lot more people get vaccinated, a lot more people get boosted, and although you don't eliminate or eradicate it, that infection is not dominating your life."