A record 325,000 children tested positive for COVID-19 last week amid the nation's most significant COVID-19 infection surge yet, according to the American Academy of Pediatrics and the Children’s Hospital Association.

Children accounted for about 17.4% of last week's reported COVID-19 cases, down from previous weeks, when children accounted for more than a quarter of all new cases.

A total of nearly 7.9 million children have tested positive for the virus, since the onset of the pandemic.

ABC News' Arielle Mitropoulos

New York's hospitals will be required to report a breakdown of how many COVID-19 patients were admitted due to the coronavirus and how many were admitted for other needs and only discovered they were infected during their stays.

During a COVID-19 briefing on Monday, Gov. Kathy Hochul cited anecdotal reports of as many as 50% of patients at some hospitals testing positive for the virus who were actually admitted for other reasons, such as car accidents.

"I just want to always be honest with New Yorkers about how bad this is," Hochul said. "Yes, the sheer number of people infected are high, but I want to see whether or not the hospitalizations correlate with that."

She continued, "And I'm anticipating to see that at least a certain percentage overall are not being treated for COVID."

Hospitals will begin reporting their breakdowns Tuesday, but it's unclear how soon the data will be publicly available.

-ABC News' Joshua Hoyos and Will McDuffie

U.S. Surgeon General Dr. Vivek Murthy warned that COVID-19 cases and hospitalizations will continue to increase as the omicron variant rapidly spreads across the country.

"The next few weeks are going to be tough for us," he told ABC's "The View" on Monday. "We’re already seeing record levels of cases, and we're seeing hospitalizations starting to tick up. We're seeing some of our hospital systems getting strained at this point."

Information from South Africa and the United Kingdom indicates omicron could be less severe than previous COVID-19 variants, Murthy said.

"We’re still going to see a lot of people get sick and a lot of hospitalizations, but the overall severity may end up being significantly lower," he said.

Murthy said both South Africa and the U.K. "had a very rapid rise, but then they had a very steep fall" in cases

"I'm hoping that that’s what happens here too," he added.

-ABC News' Joanne Rosa

Starbucks is requiring its 220,000 workers to get the COVID-19 vaccine or be tested weekly, complying with the Biden administration's vaccine mandate for private businesses.

Employees must reveal their vaccination status by Jan. 10, according to a letter sent Monday by Starbucks Chief Operating Officer John Culver, Reuters first reported.

"This is an important step we can take to help more partners get vaccinated, limit the spread of COVID-19, and create choices that partners can own based on what's best for them," Culver wrote.

Workers will have until Feb. 9 to be fully vaccinated.

Those who choose to undergo weekly testing instead will be responsible for obtaining their own tests -- which cannot be self-administered or taken at home -- and submitting results.

About half of COVID-19 patients hospitalized in New York City were originally admitted for other reasons, Gov. Kathy Hochul said.

Across the state, 42% of COVID-19 patients entered hospitals for reasons unrelated to the virus, such as a car accident, and only learned they were positive during their stays, Hochul said during a press conference Friday.

This is the first time that New York has differentiated between patients who go to hospitals to get care for COVID-19 and those who seek out care for other issues but test positive upon arrival.

Hochul also asked New Yorkers who have mild symptoms to not got to emergency rooms to get tested or treated because many hospitals are currently understaffed.

"If you're an adult with very minor symptoms, you can handle a runny nose. You can handle the throats being a little sore, a little bit of a cough. Just treat as if you would the flu, all the protocols," she said. "But please don't overburden our emergency rooms."

Hochul added that nearly 20% of all emergency rooms in the state are made up of people who are there only to get tested for COVID-19.

-ABC News' Will McDuffie