Pending the CDC panel's recommendations and the CDC director's sign-off, more than 26 million Americans could soon be eligible for a third Pfizer dose. This includes 13.6 million adults 65 and older and 12.8 million adults ages 18 to 64 who completed their primary series at least six months ago. Of those 18 to 64, anyone who is considered “high risk” could be eligible for an additional dose.

To date, more than 220 million Pfizer doses have been administered in the U.S.

-ABC News' Sasha Pezenik, Sony Salzman, Arielle Mitropoulos

The CDC’s independent advisory panel is set to vote around 3 p.m. ET on which Americans are eligible now for a Pfizer booster.

After the vote, CDC director Rochelle Walensky is expected to weigh in with her official endorsement. The CDC is not bound by the panel's recommendations but usually follows it. State officials may also implement their own criteria.

he FDA granted authorization Wednesday to the following groups: Anyone 65 or older as well as people as young as 18 if they have a medical condition that puts them at risk of severe COVID-19 or if they work a frontline job that makes it more likely that they would get infected. After authorization Wednesday night, the FDA's acting commissioner Dr. Janet Woodcock said some of the groups that could be classified as front-line workers are health care employees, teachers and grocery store staffers, as well as people in prisons and homeless shelters.

-ABC News' Sasha Pezenik

Alaska currently has the country's highest case rate, followed by West Virginia, Wyoming, Kentucky, Montana and South Carolina, according to federal data.

West Virginia and Montana have seen their case rates double over the last month. In Alaska, case metrics are at record highs, according to federal data.

Hospital admissions are down by about 12.5% in the last week, with improvements in Florida, Mississippi and Louisiana, according to federal data.

Seven states, however, have less than 10% ICU availability: Alabama, Arkansas, Georgia, Idaho, Kentucky, Oklahoma and Texas.

Even highly vaccinated states are experiencing shortages. One central Massachusetts health system, UMass Memorial Health, is running low on critical care beds following the admission of an influx of COVID-19 patients in recent weeks.

-ABC News' Arielle Mitropoulos

The U.S. Olympic and Paralympic Committee said it will require every member of its delegation to be vaccinated against COVID-19, starting this year.

According to a new policy posted on Team USA's website, a COVID-19 vaccine mandate will take effect on Nov. 1 for "all employees, athletes, contractors and others," unless they obtain a medical or religious exemption prior to accessing U.S. Olympic and Paralympic Committee facilities.

On Dec. 1, that mandate will "extend to all Team USA delegation members or hopefuls for future Games." Individuals on the long list for the 2022 Winter Olympics in Beijing must submit proof of full COVID-19 vaccination by this date or have received an exemption in order to participate in the upcoming Games, according to the policy, which was dated Sept. 21.

"The health and well-being of our Olympic and Paralympic community continues to be a top priority," Team USA says on a webpage detailing the new requirement. "This step will increase our ability to create a safe and productive environment for Team USA athletes and staff, and allow us to restore consistency in planning, preparation and optimal service to athletes."

The United Kingdom and South Korea have agreed to share COVID-19 vaccine doses to mutually support the rollout of shots in each nation.

The U.K. will send 1 million of the Pfizer-BioNTech vaccine doses to South Korea to enhance their vaccination program, with the first batch of shots expected to arrive in the coming weeks. South Korea will return the same volume by the end of the year, as the U.K. presses ahead with its vaccine rollout and booster shot program over the winter months, according to a press release from the U.K. Department of Health and Social Care.

The swapping initiative, similar to the arrangement between the U.K. and Australia, will help South Korea toward hitting its target of administering a second dose to 70% of its population by the end of October.

"The Republic of Korea is a strategic partner for the UK and the sharing of one million vaccines benefits both countries as we help build resistance against COVID-19 and save lives," British Foreign Secretary Liz Truss said in a statement Tuesday.

The deal will have no impact on the U.K.'s ongoing vaccine rollout or booster shot program, nor will it effect the doses the country has already pledged to give to the global vaccine-sharing initiative COVAX. Almost 90% of people over the age of 16 in the U.K. are fully vaccinated against COVID-19, and Pfizer-BioNTech vaccine doses are not immediately required in the U.K. due to robust supply management, according to the U.K. Department of Health and Social Care.