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

Public school students in New Jersey will be required to wear masks when school starts up again, Democratic Gov. Phil Murphy announced Friday.

The rules, which will apply to K-12 students, are a departure for Murphy, who previously said school mask mandates would be left up to each district.

"I want as much as anybody else in our state to see our kids' smiles as they start their school years. But I do not want to see any of them getting sick needlessly or schools have to shut down again and go remote because of an outbreak," Murphy told reporters.

The governor stressed that the mask mandate is not permanent.

"As soon as conditions allow -- and please God sooner than later -- we will lift this requirement again," he said.

-ABC News' Will McDuffie

Florida reported a seven-day average of 17,757 new cases Thursday, meaning that 20% of new cases are now occurring in the state, according to data from the U.S. Department of Health and Human Services.

Republican Gov. Ron DeSantis has repeatedly criticized COVID-19 restrictions and mask mandates, even as infections and hospitalizations in his state soared to record levels.

Despite its high case count, Florida's vaccination rate is on par with the national average. As of Friday, 49% of Florida residents were fully vaccinated, according to the CDC, compared with 50% of all Americans.

An Albany, Georgia, hospital system has seen a worrying spike in COVID-19 hospitalizations. "A month ago, we had eight COVID patients in our hospitals. Today, we’re caring for 97. That’s a staggering 1,126% increase in just over four weeks," said Scott Steiner, Phoebe Putney Health System's president and CEO.

"Our current challenges are exacerbated by a lack of available contract staff to support the Phoebe Family. Every hospital in our region is stretched to its limit," he added. Steiner urged residents to support health care workers. "Get vaccinated, wear masks and take appropriate steps to slow down the spread of the virus," he said.

-ABC News' Brandon Baur

Nearly 72,000 children in the U.S. tested positive for COVID-19 last week, a massive jump from the approximately 39,000 cases among kids one week earlier, according to a new report from the American Academy of Pediatrics and the Children’s Hospital Association.

Children represented 19% of all COVID-19 cases for the week ending July 29.

Severe illness due to COVID-19 remains "uncommon" among children, the two organizations wrote in the report. According to the nearly two dozen states that reported pediatric hospitalizations, 0.1% to 1.9% of all child COVID-19 cases resulted in hospitalization.

However, the two organizations warned that there is an urgent need to collect more data on long-term impacts of the pandemic on children, "including ways the virus may harm the long-term physical health of infected children, as well as its emotional and mental health effects."

-ABC News’ Arielle Mitropoulos