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.
Of the more than 857,000 vaccine doses administered in the U.S. on Thursday, 563,000 were newly vaccinated people -- the highest number since July 1, Cyrus Shahpar, the White House's COVID-19 data director, tweeted Friday.
Over 190 million Americans have now had at least one dose, accounting for 69.6% of adults, he tweeted.
-ABC News’ Will Gretsky
Six passengers on Royal Caribbean’s Adventure of the Seas ship have tested positive for COVID-19 during routine testing, the cruise line said Friday.
Four of the passengers -- who were not traveling together -- are vaccinated. The other two are unvaccinated minors who were traveling together, the cruise line said.
One person has mild symptoms. The other five have no symptoms, the cruise line said.
"The guests were immediately quarantined, and their immediate travel party and all close contacts were traced and all tested negative," Royal Caribbean said. "Each guest and their immediate travel parties disembarked in Freeport, The Bahamas, and separately traveled home via private transportation."
This cruise started in the Bahamas on July 25. Everyone over 16 must be fully vaccinated and test negative before boarding, the cruise line said.
-ABC News’ Sam Sweeney
As Broadway gears up for its return in September, the Broadway League announced Friday that everyone attending a show must be vaccinated and wear a mask.
Guests will need to show proof of vaccination when they enter the theater.
This rule applies through October 2021 and may change in November.
All performers, staff and backstage crew also must be vaccinated.
Starting Friday, New Yorkers who receive their first dose of the COVID-19 vaccine at any city-run site will get a $100 incentive.
New York Mayor Bill de Blasio made the announcement during a press briefing Wednesday.
"We will say thank you. We'll say we're really glad that you got vaccinated for yourself, for your family, for your community," de Blasio said. "And here's $100 to thank you for doing the right thing and to encourage people."
The mayor said that New Yorkers getting vaccinated will not only get the cash, they'll also be able to do "everything else that's wonderful in this city, including the amazing concerts coming up. You can't go to those concerts unless you're vaccinated."
