The nation’s current seven-day average of 481,000 new COVID-19 vaccinations a day is the highest rate recorded since June 18, White House COVID Data Director Cyrus Shahpar said.

More young Americans are getting shots as well, with the daily average of 12-to-15-year-olds doubling over the last month.

Florida’s COVID-19 cases have continued to soar week after week, with 134,506 new virus cases reported over the past week, according to the state Department of Health.

That beats last week’s weekly record of 110,420 new infections.

Now the weekly case positivity rate in the state stands at 18.9%. There were also 175 virus deaths reported over the past week.

-ABC News’ Joshua Hoyos

As of Saturday, there are 409 positive COVID-19 cases at the Olympics, According to Tokyo 2020's coronavirus case list.

That is an increase of 22 cases since Friday.

All of the people who tested positive are either Games-concerned personnel, Tokyo 2020 contractors, media or volunteers. One Games-concerned employee was in the Olympic Village at the time of their positive test.

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.

Mississippi is facing "a phenomenal increase in daily reported cases of COVID, and this is entirely attributable to the delta variant, which is sweeping over Mississippi like a tsunami," state health officer Dr. Thomas Dobbs said Thursday.

Dobbs said 97% of new cases are among the unvaccinated, and that 89% of hospitalizations and 85% of deaths are unvaccinated.

Dobbs pleaded with the public to get vaccinated, stressing that the unvaccinated population is driving the current surge, but that vulnerable, vaccinated people are suffering the fallout.

"There is going to be some collateral damage, unfortunately, even folks who've done everything they can to protect themselves," Dobbs said.

"The minority of folks who are vaccinated and hospitalized are overrepresented by the older and those with weaker immune system, so we're seeing a pretty dramatic spillover effect from the transmission in the community to more vulnerable parts of our population," he said.

-ABC News' Soorin Kim