Coronavirus updates: US reports nearly 300,000 new cases in all-time high

President-elect Joe Biden and future first lady Jill Biden thanked front-line workers in a pretaped segment for "Dick Clark’s Rockin’ New Year’s Eve," telling host Ryan Seacrest the country "owed them for their service."

"They did so much. They risked their lives, they've done so much for us and we owe them,” Joe Biden said. 

“We're so grateful for everything they did," Jill Biden added. "You know, they left their families and their homes so that we could be safe and all Americans truly appreciate what they did for us.”

The Bidens talked about getting Pfizer's COVID-19 vaccine two weeks ago and urged others to get the vaccine.  

"I took it, it doesn't hurt. I didn't have any aftereffects," Jill Biden said. "So, everybody has to take it so that we can all be safe.”  

The president-elect also looked ahead to 2021, saying he was “absolutely confident” that the country will come back stronger than ever. 

ABC News' Beatrice Peterson and Molly Nagle contributed to this report.

Florida has identified its first case of the U.K. COVID-19 variant, health officials said Thursday night.

The case is in a Martin County man in his 20s "with no history of travel," the Florida Department of Health said on Twitter. 

This marks the third state in the U.S., following Colorado and California, to identify cases of the variant.

U.K. health officials have found that the new COVID-19 variant isn’t more deadly than the prior dominant variant, but it is likely more transmissible. Experts also believe that the authorized vaccines will still be effective against it.

December was the deadliest month of the pandemic in the U.S., even with data disruptions due to the holidays, according to The COVID Tracking Project. 

There were 76,580 reported deaths due to COVID-19 this month, far surpassing the previous record of 55,267 set in April. Every week in December was deadlier than any week earlier in the year, the tracker said.

There were 221,444 new cases and 3,255 deaths reported on Thursday, according to the tracker. A record 125,379 people are also currently hospitalized with COVID-19.

There continue to be disruptions in testing, case and death figures due to the holidays, though hospitalizations "remain relatively stable," the tracker said.

Los Angeles County reported a record-breaking 290 new COVID-19 deaths on Thursday, health officials said. 

There have been 10,345 total COVID-19 deaths in the county. 

Someone dies of COVID-19 in L.A. County every 10 minutes, the Los Angeles County Department of Public Health said. All day Thursday, the department is tweeting a description of a potential COVID-19 victim every 10 minutes.

Barbara Ferrer, director of the health department, warned that "hundreds more people" will die each week from COVID-19 and urged people to stay home this New Year's Eve and throughout the weekend.

"As we see 2020 come to a close, we are experiencing extreme conditions in LA County," Ferrer said during a briefing. "With no decline in the number of new cases, our hospitals continue to be overwhelmed."

The county reported 15,129 new cases while 7,546 people are currently hospitalized with COVID-19, officials said. The daily test-positivity rate is an "alarming" 22%, Ferrer said. 

The latest numbers come as the Los Angeles County Sheriff's Department is mobilizing a "super-spreader task force" to target illegal parties. 

As of Wednesday, the department had made 235 arrests this month at "super-spreader" events, Sheriff Alex Villanueva said. 

ABC News' Matthew Fuhrman and Michelle Mendez contributed to this report.