Early in the pandemic, 10% of patients who died from COVID-19 in Los Angeles County did not have underlying conditions, according to health officials. Today, that number has risen to 14% of patient deaths.

"This indicates, that in fact, that more people than ever are not only passing away, but passing away without any underlying health conditions," Barbara Ferrer, director of the Los Angeles County department of public health, said during a New Year's Eve news conference.

Hospitals in Los Angeles are currently overwhelmed to the point that ambulances are waiting hours in emergency bays with patients inside, which prevents medics from responding to additional emergency calls. The death toll in Los Angeles County stands at 10,345.

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.

A staggering 299,087 new cases of COVID-19 were confirmed in the United States on Saturday, according to a real-time count kept by Johns Hopkins University.

It's the highest tally of newly diagnosed COVID-19 infections that a country has recorded in a 24-hour reporting period since the start of the pandemic.

An additional 2,398 deaths from COVID-19 were also registered nationwide on Saturday, down from a peak of 3,750 on Dec. 30, according to Johns Hopkins data.

COVID-19 data may be skewed due to possible lags in reporting over the holidays followed by a potentially very large backlog.

A total of 20,430,088 people in the U.S. have been diagnosed with COVID-19 since the pandemic began, and at least 350,214 of them have died, according to Johns Hopkins data. The cases include people from all 50 U.S. states, Washington, D.C., and other U.S. territories as well as repatriated citizens.

Much of the country was under lockdown by the end of March as the first wave of pandemic hit. By May 20, all U.S. states had begun lifting stay-at-home orders and other restrictions put in place to curb the spread of the novel coronavirus. The day-to-day increase in the country's cases then hovered around 20,000 for a couple of weeks before shooting back up over the summer.

The numbers lingered around 40,000 to 50,000 from mid-August through early October before surging again to record levels, crossing 100,000 for the first time on Nov. 4 and reaching 200,000 for the first time on Nov. 27.