The U.S. saw its largest single-day increase in nearly nine months Friday.
The United States is facing a COVID-19 surge this summer as the more contagious delta variant spreads.
More than 613,000 Americans have died from COVID-19 and over 4.2 million people have died worldwide, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.
Just 57.9% of Americans ages 12 and up are fully vaccinated against COVID-19, according to data from the Centers for Disease Control and Prevention.
The CDC on Tuesday, citing new science on the transmissibility of the delta variant, changed its mask guidance to now recommend everyone in areas with substantial or high levels of transmission -- vaccinated or not -- wear a face covering in public, indoor settings.
The University of Missouri is requiring masks in classrooms, including for those who are vaccinated as of Aug. 2, the school said.
COVID-19 cases are surging in Missouri. The state's positivity rate stands at 14.7%.
The university said the temporary mask requirement will be reviewed by Sept. 15.
-ABC News’ Will Gretsky
Masks are now required for everyone -- including vaccinated people -- in all federal buildings that are in areas of high or substantial transmission, according to an Office of Management and Budget official. That includes federal offices in Washington, D.C., which is currently in substantial transmission status.
-ABC News’ Sarah Kolinovsky
Over 754,000 doses of COVID-19 vaccines went into the arms of people across the United States on Wednesday, according to White House COVID-19 data director Cyrus Shahpar.
That figure includes 498,000 newly vaccinated individuals, Shahpar said, which is the highest daily amount reported since July 1.
The U.S. is now averaging more than 600,000 total shots administered per day, an increase of about 18% compared with last week, according to data from the Centers for Disease Control and Prevention.
As the 2020 Summer Olympics plays out in Tokyo, the host city saw a record-breaking number of newly confirmed cases of COVID-19 for the third straight day.
A new all-time high of 3,865 cases were reported on Thursday, up from 3,177 on Wednesday and double the daily count a week ago, according to data from Tokyo's metropolitan government. The Games, which were postponed for a year due to the coronavirus pandemic, are being held under a regional state of emergency and stringent restrictions.
Although Japan has managed to keep its COVID-19 cases and death toll lower than many other countries, its numbers have been on the rise in recent weeks with infections soaring not just in the capital city but across the nation.
"We have never experienced the expansion of the infections of this magnitude," Japanese chief cabinet secretary Katsunobu Kato told reporters Tuesday.
At least 198 confirmed cases have been associated with the Tokyo Olympics. Of those, 24 were reported on Thursday and include three athletes who are staying at the Olympic Village, according to data from the Tokyo 2020 organizing committee.
