Secretary of Defense Lloyd Austin has tested positive for COVID-19, he confirmed in a statement Sunday evening.

"I tested positive this morning for COVID-19. I requested the test today after exhibiting symptoms while at home on leave," he said.

He added that his symptoms are mild and he is following his physician's directions.

"In keeping with those directions, and in accordance with CDC guidelines, I will quarantine myself at home for the next five days," Austin said, referring to the Centers for Disease Control and Prevention's recently-updated isolation guidelines.

Austin said he will be attending virtual meetings if possible while in quarantine.

"I have informed my leadership team of my positive test result, as well as the President. My staff has begun contact tracing and testing of all those with whom I have come into contact over the last week," he said in his statement, adding that his last meeting with President Joe Biden was on Dec. 21, "more than a week before I began to experience symptoms."

"I tested negative that very morning. I have not been in the Pentagon since Thursday, where I met briefly - and only - with a few members of my staff. We were properly masked and socially distanced throughout," he said.

Austin said he is fully vaccinated and boosted, and his doctor made clear to him that thanks to that, his infection is much more mild than it would otherwise have been -- which he is grateful for.

More than 8,773 people are hospitalized in New York state with COVID-19 -- the highest number since January 2021, according to state health officials.

Roughly 1,518 people were admitted to hospitals in the last 24 hours, and there are 1,133 patients in ICU beds, the health department said.

One of the largest testing companies in the country said the jump in COVID-19 tests has led to an increase in time for results.

Quest Diagnostics told ABC News their turnaround time for results has now stretched to two to three days on average.

Last week, the company said it took a day, on average, to get results.

On Wednesday, Quest told ABC News they were deploying their logistics network, such as its national courier and air fleet, to move specimens around to where there is less inundation and help balance out volume across their roughly two dozen labs.

However, the increase in omicron cases and the busy holiday season led to delays.

Other labs are also experiencing long wait times for results, including CityMD, which said it can take patients up to seven days to get their results.

-ABC News' Sasha Pezenik

New York state has once again broken its single-day COVID-19 case record.

There were 85,476 new cases reported Saturday, according to the governor's office.

The number of COVID-19 tests administered also increased by over 44,000 in the last 24 hours.

The state's seven-day positivity rate is nearly 20%.

On Friday, Gov. Kathy Hochul announced new measures to target the state's winter COVID-19 surge, including opening more state-run testing sites, distributing rapid tests to schools and increasing vaccination and booster rates among children and nursing home residents.

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