Coronavirus updates: Chris Christie speaks out after contracting COVID-19

The Czech Republic confirmed 9,721 new cases of COVID-19 on Thursday, its highest single-day rise yet.

The previous record of 9,544 new cases was set a day earlier, meaning it's the second straight day that the country has reported its highest increase in infections.

The cumulative total now stands at 149,010 cases with 1,230 deaths, according to the Czech health ministry. Almost 50,000 of those cases were registered last week.

More than 84,000 cases were active Friday, including 2,920 patients who remained hospitalized for COVID-19, while over 63,000 have recovered from the disease, according to the health ministry data.

The Czech Republic has the highest rate of COVID-19 infection in Europe. Over the past two weeks, the country of 10.7 million people has reported 701.9 cases per 100,000 population, according to data published Friday by the European Center for Disease Prevention and Control.

The Czech government said hospitals could reach full capacity around the end of the month due to growing number of COVID-19 patients. Over the weekend, the Czech military will start building a field hospital in Prague that will be able to house 500 patients.

The number of new cases of COVID-19 recorded in the United States increased by double digits in week-over-week comparisons, while the number of deaths is also on the rise, according to an internal memo from the U.S. Department of Health and Human Services that was obtained by ABC News on Thursday night.

The memo, which is circulated among the highest levels of the federal government and is used to determine daily priorities for the agencies working on a COVID-19 response, said 38 U.S. states and territories are in an upward trajectory of new infections, while 8 jurisdictions are at a plateau and 10 others are in a downward trend.

There were 366,455 new cases confirmed during the period of Oct. 8-Oct. 14, a 16.4% increase from the previous week. There were also 4,893 fatalities from COVID-19 recorded during the same period, a 3.1% increase compared with the week prior, according to the memo.

The national positivity rate for COVID-19 tests dropped from 6% to 5% in week-to-week comparisons. Meanwhile, 24% of hospitals nationwide have more than 80% of beds full in their intensive care units. That figure was 17%-18% during the summertime peak, the memo said.

Arkansas saw its death toll from COVID-19 increase by 25% during the week ending Oct. 11. Case rates continue to rise in rural parts of the state, according to the memo.

A review of death certificates in Georgia revealed that while Black residents make up 30% of the state's population, they account for 48% of the 7,416 deaths from COVID-19 to date. Just over 82.4% of ICU beds and 81.3% of inpatient beds were occupied in Georgia during the period of Oct. 5-11, the memo said.

In Iowa, 7% of new cases are being reported in the 18-40 age group. COVID-19 hospitalizations across the state reached an all-time high on Oct. 7, with 449 reported admissions, according to the memo.

Kentucky broke its record for weekly case count on Oct. 1 for the third straight week, the memo said.

New Mexico saw its number of new cases increase 53.3% in the week ending Oct. 11, compared to the week prior. The Albuquerque area experienced a relative increase of 89.5% in new cases between Oct. 4 and Oct. 11, according to the memo.

ABC News' Josh Margolin contributed to this report.

Former New Jersey Gov. Chris Christie spoke exclusively to ABC News on Friday morning for the first time since he tested positive for COVID-19 and was released from the hospital.

"It hits you like a freight train." Christie told ABC News chief anchor George Stephanopoulos in an interview on "Good Morning America." "It all happened very, very quickly. Within 24 hours, I went from feeling absolutely fine to being in the intensive care unit."

Christie, who has asthma, spent seven days in the ICU while battling COVID-19. He said he received an antibody treatment in combination with the antiviral medication remdesivir early on in the course of his illness.

"The last two or three days, I've really kind of turned around in terms of being able to recover and getting a lot of my energy back," he said. "So I'm not yet 100%, but I'm about a fighting 80%."

Christie admitted he "was wrong" and "made a mistake" in not wearing a face mask while recently helping President Donald Trump prepare for the debate.

"I was led to believe that all the people that I was interacting with at the White House had been tested and it gave you a false sense of security, and it was a mistake," he said. "I was doing it right for seven months and avoided the virus. I let my guard down for a couple days inside the White House grounds and it cost me unfortunately in a significant way."

Christie urged the public to wear masks, saying, "there is no downside to you wearing masks and, in fact, there can be a great deal of upside."

"I think no matter what you're doing, whether you're at a rally for your preferred candidate, whether you're out at the supermarket, whether you're at a protest, no matter what you're doing, you should have a mask on and you should try to remain socially distant from folks," he said. "I did it for seven months, George, and I stayed healthy. I didn't do it for four days and I wound up in the ICU."

Russia confirmed another 15,150 new cases of COVID-19 in the last 24 hours, its highest daily tally yet.

It's the first time since the start of the coronavirus pandemic that Russia has registered more than 15,000 cases in a single day. The latest daily case count is nearly 1,400 more than the previous day.

More than 33% of the newly confirmed cases were reported in the capital, Moscow, the epicenter of the country's COVID-19 outbreak, according to Russia's coronavirus response headquarters.

An additional 232 deaths from COVID-19 were also registered in the past 24 hours, down from the national record of 286 set the previous day. The cumulative totals now stand at 1,369,313 cases and 23,723 deaths, according to the country's coronavirus response headquarters.

Russia has been breaking its own records for daily case counts and deaths almost every day since Oct. 9. The country of 145 million people has the fourth-highest tally of COVID-19 cases in the world, behind only the United States, India and Brazil.

ABC News' Alina Lobzina contributed to this report.