COVID-19 updates: American Airlines to require employee vaccinations

At Tuesday's White House briefing, Dr. Anthony Fauci gave a loose timeline for when the FDA could have enough data to consider approving mixing and matching vaccines.

Moderna has already submitted data about using its shot as a booster for people who have received the Pfizer or Johnson & Johnson vaccines.  J&J will submit data on mixing its shot with the other vaccines in the next week, according to Fauci, and then Pfizer will submit its data within the first two weeks of October. Finally, the data will be examined by the FDA.

-ABC News' Cheyenne Haslett

Over 400,000 Americans received a booster shot at a pharmacy since Friday and nearly 1 million more have scheduled appointments in the next few weeks, according to the White House.

The U.S. is expected to hit a milestone of 200 million Americans with at least one shot on Wednesday, White House COVID-⁠19 response coordinator Jeff Zients said.

The White House also touted another important milestone: racial equity in vaccinations nationwide.

According to a new Kaiser Family Foundation poll, 73% of Latinos and 70% of Black Americans have now gotten at least one shot, compared to 71% of white Americans. In May, this same poll found that 65% of white Americans were vaccinated compared to 56% of Black Americans.

-ABC News' Cheyenne Haslett

At the beginning of the month, there were more than 104,000 patients hospitalized with COVID-19. As of Tuesday, there were 81,000 patients hospitalized -- a drop of about 23,000 patients, according to federal data.

Nearly 50% of those patients -- 11,000 -- are from Florida, where cases and hospitalizations have been plummeting since mid-August.

In recent weeks, however, 16 states have reported higher hospital admission metrics, according to federal data: Colorado, Delaware, Idaho, Iowa, Maine, Maryland, Michigan, Minnesota, Nebraska, New Hampshire, North Dakota, Ohio, Pennsylvania, Rhode Island, Vermont and West Virginia.

Five states -- Alabama, Georgia, Idaho, Kentucky and Texas -- have ICU capacities of 10% or less, according to federal data.

Alaska has the country's highest case rate, followed by West Virginia, Wyoming, Montana, Idaho, North Dakota and Kentucky.

-ABC News' Arielle Mitropoulos

New York City Mayor Bill de Blasio said there's been a 45% increase in the daily vaccination rate since vaccine mandates were launched in July.

All city-run and private hospitals appear to be operating normally after health workers faced a midnight deadline to get vaccinated or risk losing their jobs. About 500 nurses for NYC Health + Hospitals are not at work.

NYC Health + Hospitals now has a 91% vaccination rate, up from 90% on Monday. City officials said about 5,000 employees were unvaccinated in the hospital system, down from more than 8,000 a week ago.

Northwell, New York state’s largest private hospital system, said it fired about two dozen "unvaccinated leaders," management level or above, for not getting vaccinated. 

“We are now beginning the process to exit the rest of our unvaccinated staff," Northwell said in a statement.

-ABC News' Aaron Katersky