President-elect Joe Biden has applauded the COVID-19 relief bill passed Monday by the House and Senate.

In a tweet early Tuesday morning, Biden voiced his approval of the package, but warned that Congress still has more work to do in the new year.

"I applaud this relief package, but our work is far from over. Starting in the new year, Congress will need to immediately get to work on support for our COVID-19 plan

My message to everyone out there struggling right now: help is on the way," he tweeted.

The Chairman of the Joint Chiefs of Staff Gen. Mark Milley and other top military officials received Pfizer's COVID-19 vaccine Monday, according to a Joint Staff spokesman.

Milley's team tweeted photos of him, Vice Chairman Gen. John Hyten, and Senior Enlisted Advisor Ramón Colón-López Monday, each with a needle in his arm.

“Today I, along with the Vice Chairman and the SEAC, received the #COVID19 vaccine. It’s my distinct honor to represent the Joint Force in this capacity. This vaccine is safe and effective and will protect our force as we work to protect American citizens," Milley was quoted as saying in the official tweet.

Chief of Naval Operations Adm. Michael Gilday also tweeted a photo of himself receiving the vaccine on Monday.

"By maximizing vaccination among our force and maintaining our mitigation measures of physical distancing, mask-wearing, and handwashing, we will begin the return to normal. Safe and healthy is the goal for 2021! Together, we will make this happen," the tweet read.

-ABC News' Matt Seyler

The U.S. broke another record for coronavirus hospitalizations Monday, the COVID Tracking Project reported.

There were 115,351 people hospitalized across the nation on Dec. 21, according to the health data.

The country recorded 178,191 new cases and 1,485 new deaths, the tracking project reported.

The seven-day average of hospitalizations, 113,912, and deaths, 2,631, broke records, according to the health data.

"COVID-19 deaths are rising in 19 states," the tracking project tweeted.

The number of new coronavirus cases and deaths jumped over the last seven days, according to an internal U.S. Department of Health and Human Services memo obtained by ABC News.

In the last week, the country recorded 1,677,232 new cases, which was a 13.6% increase from the previous seven-day period, according to the memo.

There were 18,578 deaths recorded during the last seven days, marking a 9.2% jump from the previous week, according to HHS.

Nearly 30% of hospitals across the country have more than 80% of their ICU beds filled, the memo said.

Several states recorded large jumps in hospitalizations last week, according to HHS.

On Dec 18, Louisiana state officials reported its 30-day increase in hospitalization was 82% and there were only 19.1% of ICU beds were available, according to the memo.

Nevada's COVID-19 deaths increased by 21% in the week ending Dec. 15, compared to the prior week, HHS said.

-ABC News' Josh Margolin contributed to this report

The U.S. is now averaging 2,613 new coronavirus-related deaths per day -- more than triple the seven-day average from two months ago, according to ABC News’ analysis of data compiled by the COVID Tracking Project.

So far this month, 49,752 Americans have died from COVID-19, according to the COVID Tracking Project.

In the last seven days, there have been approximately 18,000 deaths recorded -- equaling approximately 108 American deaths reported every hour.

In the week ending Dec. 19, 16 states hit a record number of new deaths: Alabama, Arizona, California, Delaware, Kansas, Kentucky, Missouri, Nevada, New Hampshire, North Carolina, Oregon, Rhode Island, Tennessee, Virginia, Washington and West Virginia.

ABC News’ Arielle Mitropoulos contributed to this report.