More than 300 children with COVID-19 are in Ohio hospitals, including Dayton Children's Hospital, where workers are seeing a significant increase in pediatric COVID-19-related hospitalizations.

Dr. Vipul Patel, chief of pediatric intensive care at Dayton Children's, told ABC News the ICU is now busier than at any other point in the pandemic.

COVID-19 is only exacerbating previously existing health issues for many children, Patel explained, adding that many parents are shocked to see their children become so sick, and some families have even expressed regret for not vaccinating their kids. Nationwide, about 35% of eligible children (ages 5 to 17) are fully vaccinated, according to federal data.

Dayton Children's respiratory therapist Hillary O’Neil said it's been particularly difficult to see children who are too young to understand what is happening sick and scared.

“You can see it in the faces of kids that can’t talk -- their eyes get really big and they, we watch them struggle to breathe,” O’Neil said. “Then on top of that we watch their parents struggle to watch their child, and that is sometimes just as hard as watching the kids.”

Jackie Kerby, whose baby, Enaeshya, is hospitalized with COVID-19, told ABC News, "She’s getting these fevers in the night, and they’re not coming down. … I am terribly scared."

Across the U.S. more than 5,000 children are currently hospitalized with a confirmed or suspected case of COVID-19, according to federal data. On average, hospital admissions among children have quadrupled over the last month.

-ABC News' Arielle Mitropoulos, Kayna Whitworth

New York state's COVID-19 cases are falling after experiencing a major surge over the holidays, according to state data.

New York recorded 60,374 new cases in the last 24 hours -- an improvement from New Year's Day when 85,476 daily cases were reporting during a spike in testing demands.

The Supreme Court has issued a stay of the vaccine-or-test requirement imposed on private businesses with at least 100 employees by the Occupational Safety and Health Administration.

In a 6-3 ruling, with the three liberal justices dissenting, the court finds likelihood the challengers will prevail and that OSHA exceeds its authority.

At the same time, the justices voted 5-4 to allow the Biden administration to require health care workers at facilities that treat Medicare and Medicaid patients to be vaccinated, subject to religious or medical exemptions.

-ABC News' Devin Dwyer

About 8,000 of Delta Air Lines' 75,000 employees had COVID-19 over the last four weeks, Delta CEO Ed Bastian told CNBC.

"Good news is that they were all fine. There's been no significant issues," he said.

"But it's knocked them out of the operation" amid the busiest travel season in two years, he said.

United CEO Scott Kirby said Tuesday that around 3,000 of United workers have COVID-19 right now.

Across the U.S., 3,783 TSA employees are currently at home with COVID-19, the agency said.

-ABC News' Mina Kaji, Sam Sweeney

Uganda reopened its schools to students on Monday after nearly two years, ending the world's longest school closure due to the coronavirus pandemic.

Schools across the East African nation of 44 million people have been fully or partially closed since March 2020, when the pandemic began. The closures affected more than 10 million learners, according to data from the United Nations Educational, Scientific and Cultural Organization (UNESCO).

Save the Children welcomed the reopening of Uganda's schools but warned that "lost learning may lead to high dropout rates in the coming weeks without urgent action."

The London-based charity revealed in a report last November that up to one in five children in low-income countries, including Uganda, had dropped out of school due to rising poverty, child marriage and child labor, which have been exacerbated by the pandemic. In a statement Monday, Save the Children warned of "a 'second wave' of dropouts as returning students who have fallen behind in their learning fear they have no chance of catching up."

To tackle the potential crisis in Uganda, Save the Children has launched "Catch-up Clubs," which assess children and teaches them at the required level to help them regain literacy and other learning, with child protection support and cash assistance for families struggling to send them to school.

"As schools begin to reopen across the country, it is critical that all girls and boys have access to the support they need to successfully return to the classroom," Edison Nsubuga, head of education at Save the Children in Uganda, said in a statement Monday. "Many children have fallen behind in school as a result of the COVID-19 pandemic. Children who are behind in their learning are less likely to unlock their potential as adults. However, when children receive the learning boost they need and have access to quality education, they can reach their full potential."