Four Georgia sheriffs just elected to their counties have tested positive for COVID-19.

In a joint statement sent out Wednesday night, Fulton County Sheriff-elect Pat Labat and Cobb County Sheriff-elect Craig Owens said they tested positive after attending a sheriff’s school in Pine Mountain, Georgia.

Gwinnett Sheriff-elect Keybo Taylor and Henry County Sheriff-elect Reginald Scandrett also said they tested positive for COVID-19.

Others who attended the conference are quarantining in their homes as they await their COVID-19 test results.

“We urge all Georgians to follow the advice of our dedicated health care workers and to wear masks and socially distance," the sheriffs said in a joint statement. "While the vaccine is forthcoming, the pandemic is not over yet, and we must all remain diligent to ensure the safety of our communities."

The COVID Tracking Project reported Wednesday that 3,054 Americans died the previous day from the coronavirus, setting a new daily record.

The seven-day average of new daily deaths (2,276) also set a record, according to the health data.

"The 7-day average for COVID-19 deaths are at an all-time high as deaths are rising throughout the country. The previous single-day record was on May 7 at 2,769 deaths," the tracking project tweeted.

Daily hospitalizations also continued to set records as 106,688 Americans are currently hospitalized, according to the data. The seven-day average of hospitalizations was 102,580, another record.

Over 209,000 new coronavirus cases were reported on Wednesday, according to the tracking project.

"[California] reported a new single-day case record at 30,851. This is the second-highest case count since 12/6," the tracking project tweeted.

COVID-19 cases and deaths continued to grow dramatically following Thanksgiving, according to an internal memo from the U.S. Department of Health and Human Services that was obtained by ABC News.

The country recorded 1,414,153 new cases between Dec. 3 and Dec. 9, according to HHS. This represents a 25.4% increase from the previous seven-day period, the memo said.

There were 15,588 new deaths recorded from Dec. 3 to Dec. 9, which was a 44.9% jump in new fatalities compared with the previous week, according to the memo.

Roughly 31% of U.S. hospitals have more than 80% of their intensive care unit beds filled, HHS reported.

Several states saw new records during the last seven days, according to the memo.

In Alabama, new weekly coronavirus deaths increased by 158% with 312 new fatalities recorded, according to HHS.

On Dec. 7, 19 Georgia hospital ICUs could not accept any more patients, the memo said.

-ABC News' Josh Margolin

The FDA authorized LabCorp’s Pixel COVID-19 Test Home Collection Kit Wednesday for use by patients 18 years and older without a prescription.

The test allows a customer to self-collect a nasal swab sample at home and then send that sample for testing to LabCorp. The company will phone the customer with the results.

The at-home test is currently available for purchase online and the company is taking requests from retailers to sell it in stores.

LabCorp told ABC News it will screen requests to limit it to people who meet the Centers for Disease Control and Prevention criteria for testing in order to limit backlogs in their labs.

-ABC News' Stephanie Ebbs and Ali Dukakis

The chief science adviser to Operation Warp Speed, the U.S. government's initiative to expedite vaccine development, said he doesn't know what vaccine-related executive order President Donald Trump is expected to sign on Tuesday.

"Frankly, I don't know and, frankly, I'm staying out of this. I can't comment," Dr. Moncef Slaoui told ABC News chief anchor George Stephanopoulos in an interview Tuesday on "Good Morning America."

When pressed on the matter, Slaoui added: "Our work is, you know, rolling. We have plans. We feel that we can deliver the vaccines as needed, so I don't exactly [know] what this order is about."

Trump is expected to discuss the order at a COVID-19 vaccine summit to be held at the White House later Tuesday, multiple White House officials told reporters during a background briefing on Monday evening. While it's not entirely clear on how exactly the order would work, the move is designed to prevent the U.S. government from shipping any vaccine doses it has purchased to aid foreign countries until all the needs within the United States are met.

White House officials also denied reports that the Trump administration turned down an offer last summer to purchase an additional 400 million doses of a COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and that the companies now may not be able to provide more of their vaccine to the United States until June 2021 because they have committed those doses to other countries.

When asked about the matter, Slaoui explained Operation Warp Speed's strategy in securing vaccine doses.

"We selected six different vaccines to build a portfolio to manage the risk that some may work and some may not work, but also to ensure that as more than one would work that we would accumulate vaccine doses from this portfolio of vaccines," he said. "If somebody came to us and said, let's buy more of this vaccine or that vaccine, no one reasonably would buy more from any one of those vaccines because we didn't know which one would work and which one may be better than the other. Once the vaccine's performance becomes known is the right time, given the strategy we've taken, to go and order more vaccine doses, which we may be doing. And frankly, the constructive thing to do if one of the suppliers has challenges producing enough vaccine doses is to roll our sleeves and help ensure that capacity can be increased."

Slaoui said he's confident the U.S. government will be getting vaccines to Americans who need them "as soon as possible" and that plans are "still on track."

"We will work with Pfizer to try and increase capacity and have those vaccines available," he said. "We have two more vaccines from J&J and AstraZeneca that will be completing their Phase 3 trials in January and most likely, I hope, be approved for use in February. We have tens of millions of doses from those vaccines, you know, participating to the volume of vaccines we need to immunize the U.S. population as we promised, all of it by the middle of the year 2021 and that's still on track."

Slaoui said Operation Warp Speed has a meeting with President-elect Joe Biden's transition team scheduled for Thursday.

"We look forward to, you know, sharing all the information and working together," he said. "Our objective has always been outside of politics and making sure we make available these vaccines for the U.S. people, and that's what we're doing."

ABC News' Ben Gittleson, John Parkinson and Eric Strauss contributed to this report.