More than 84,000 Americans are currently hospitalized with COVID-19 -- a 40,000 jump over the last seven weeks, according to federal data.

In the last month, federal data shows the nation's daily case average has nearly tripled.

A soaring demand for tests and a backlog of holiday reporting drove Monday's case total to 440,000 -- the nation's highest one-day total ever, according to federal data.

While this high reflects the latest omicron surge, it's also very likely skewed due to a backlog in reporting over the Christmas weekend and an increase in demand for tests.

-ABC News' Arielle Mitropoulos

The FDA and CDC could decide on boosters for children ages 12 to 15 in "the days to weeks ahead," CDC Director Rochelle Walensky told CNN's "New Day" Wednesday.

The CDC authorized the Pfizer vaccine for 12- to 15-year-olds on May 12, meaning some of those kids are now over six months past their second dose, which was when boosters were recommended for adults.

Walensky also noted that vaccine manufacturers are working to acquire data for children under the age of five, but an authorization "will not be in the month ahead."

-ABC News' Arielle Mitropoulos

CDC Director Dr. Rochelle Walensky told NPR that a vaccine mandate for domestic air travel is not currently under consideration.

"Domestic flights has been a topic of conversation, but that is not something we're revisiting right now," Walensky said Tuesday.

This comes after Dr. Anthony Fauci told MSNBC's "Morning Joe" on Monday that a vaccine requirement for domestic air travel should be "seriously" considered.

-ABC News' Arielle Mitropoulos

France recorded more than 208,000 new COVID-19 cases in the last 24 hours, setting a new daily case record, Health Minister Olivier Véran said.

By that tally, "every second, two French people" have tested positive, Véran said.

-ABC News' Ibtissem Guenfoud

Last week, the CDC reported that omicron had overtaken delta to become the dominant COVID-19 variant in the U.S. However, on Tuesday, the CDC revised its initial estimates to noticeably lower numbers of omicron cases.

Last Monday, the CDC said omicron was estimated to makeup more than 73.2% of new cases as of Dec. 18. Now, the CDC says just 22.5% of new U.S. cases were estimated to be omicron as of Dec. 18. 

According to new data from this week, the CDC says omicron is now estimated to account for 58.6% of all new cases, officially making it the dominant strain in the U.S. In the New York and New Jersey region as well as the deep South, omicron is estimated to account for more than 85% of new cases. 

A CDC spokeswoman said in a statement, "There was a wide predictive interval posted in last week’s chart, in part because of the speed at which omicron was increasing. We had more data come in from that timeframe and there was a reduced proportion of omicron. It’s important to note that we’re still seeing steady increase in the proportion of omicron."

ABC contributor Dr. John Brownstein, an epidemiologist at Boston Children's Hospital, said, "It may be possible that a large portion of their [the CDC's] sequencing data had come from labs that were specifically looking for s-gene samples, thus falsely elevating the percent omicron in samples."

-ABC News' Arielle Mitropoulos