Amazon said Friday it was mandating all 900,000 of its warehouse workers wear masks, regardless of whether they are vaccinated.

The company had previously only required unvaccinated workers to wear masks. It blamed the change on the increasing risk presented by the delta variant.

"In response to the concerning spread of new COVID-19 variants in the U.S. and guidance from public health authorities and our own medical experts, we are requiring face coverings indoors regardless of vaccination status," Amazon said in a statement. "We are monitoring the situation closely and will continue to follow local government guidance and work closely with leading medical healthcare professionals, gathering their advice and recommendations as we go forward to ensure our buildings are optimized for the safety of our teams."

Many companies have taken the added step of requiring vaccinations, including fellow tech giants Google and Facebook.

The U.S. has recorded its highest single-day COVID-19 case total in exactly six months with more than 120,000 new cases reported, according to newly updated Centers for Disease Control and Prevention data.

The country is now averaging more than 96,000 new cases a day.

Additionally, every single state in the country is reporting "high" (a seven-day new case rate ≥100) or "substantial" (a seven-day new case rate between 50-99.99) community transmission.

-ABC News' Arielle Mitropoulos

Cases are skyrocketing in Louisiana, officials said Friday, with case positivity rates returning to the highs seen last spring.

Over the past two weeks, about 1% of the entire state population has become infected with COVID-19, officials said at a briefing.

The test positivity rate is now 15.4%, the highest number since April 22, 2020.

"We are at the leading edge of the surge case growth per capita and Louisiana continues to be the highest in the country," Gov. John Bel Edwards said.

Only about 37.5% of the state's population is fully vaccinated, well below the national rate of 50%.

"It is because of these grim statistics, coupled with a shortage of nurses and hospital staff that we asked the federal government to send medical strike teams our way," Edwards reported.

-ABC News' Jamie Aranoff and Jianna Cousin

New polling finds that more Americans are worried about the delta variant, which now makes up nearly all new cases in the United States.

According to an Axios/Ipsos poll, 78% of adult respondents reported being "concerned" about delta's spread, with 50% reporting that they were "extremely concerned" or "very concerned" about the new variant, representing a six point rise since late June.

A separate Kaiser Family Foundation poll, conducted in July, found that 55% of respondents believed that new variants would cause the pandemic to worsen in their area. Thirty-six percent believed they would personally get sick from a new variant.

-ABC News' Gary Langer