Starting Dec. 22, the U.S. could be on Israel's no-fly list due to high COVID infection rates. All travel from Israel to the U.S. will be banned, the Israeli government announced Sunday.

The Ministry of Health has recommended that the U.S., and nine other countries including Canada, be classified as "red list" countries. The decision now awaits final approval from the Knesset's Constitution, Law and Justice Committee.

Israeli citizens coming to Israel from the U.S. will have to go into full isolation, including those vaccinated or recovered. Non-Israeli citizens coming from the U.S. will not be allowed to enter Israel, officials said.

At the start of the weekly cabinet, Israel Prime Minister Naftali Bennett said the fact the country is in a "relatively good situation" is "not a coincidence." He attributed delaying the entry of the variant to Israel to travel bans. "What a pity that other countries did not do as we did," he said Sunday.

In addition to the U.S., Israel also will also move Belgium, Canada, Germany, Hungary, Italy, Morocco, Portugal, Switzerland and Turkey to the no-fly list this week on Dec. 22. Norway, France, Spain, Sweden and the UAE will be added to Israel's no-fly list at midnight Dec. 20.

There are 52 countries on Israel's red list.

-ABC News' Christine Theodorou

The U.K. reported a 48.59 percent single-day increase in confirmed omicron cases Sunday.

And across the U.K. in the last seven days, there's been a 51.9 percent increase in new COVID cases. Hospitalizations are up 8.1 percent during that period. However, there's been a 6.5 percent decrease in new deaths compared to the preceding seven days.

On Sunday, the British government reported 82,886 new COVID cases and 45 new deaths. The government also confirmed 12,133 new cases of the omicron variant.

London's mayor declared a major incident in the capital Sunday because of the serious threat of omicron. In an interview with the BBC on Sunday, he said that in the last 24 hours, "we're at almost 30,000 confirmed new cases, and in the last seven days almost 130,000 confirmed new cases."

He said he's worried about the impact the increases are already having on frontline emergency services in London, adding there are a record number of absences that will hamper their ability to respond to people who are unwell.

-ABC News' Christine Theodorou

"Saturday Night Live" won't have an audience and will limit its cast and crew at tonight's taping "out of an abundance of caution," the show announced, as New York sees a spike in COVID-19 cases.

"Due to the recent spike in the Omicron variant and out of an abundance of caution, there will be no live audience for tonight’s taping of 'Saturday Night Live' and the show will have limited cast and crew," tweeted the show, which films at 30 Rockefeller Plaza in Manhattan.

"The show continues to follow all government safety guidelines in addition to a rigorous testing protocol," it added.

Charli XCX was slated to be the musical guest but is no longer performing due to the limited crew, the singer announced on Twitter, saying she was "devastated and heartbroken."

Paul Rudd is the host of the episode, which is the last one of 2021.

The move comes as New York state broke its record for daily COVID-19 cases two days in a row. Several shows in New York City, from Broadway productions to the Rockettes, also have had to cancel performances due to COVID-19 cases.

-ABC News' Joshua Hoyos

Harvard University is shifting to remote learning for the first three weeks of January due to a "rapid" rise in COVID-19 cases locally, school officials announced Saturday.

"Please know that we do not take this step lightly," school leaders said in an update to students. "It is prompted by the rapid rise in COVID-19 cases locally and across the country, as well as the growing presence of the highly transmissible Omicron variant."

Only students with previous authorization will be allowed to remain on campus. Some programs, like essential in-person laboratory and patient-centered work, will continue as normal, the school said.

"We are planning a return to more robust on-campus activities later in January, public health conditions permitting," the school officials said.

Several universities, including Princeton, NYU and Cornell, have shifted final exams remote and canceled events in recent days due to spikes in COVID-19 cases.

-ABC News' Arielle Mitropoulos

School leaders at both New York University and Princeton University announced Wednesday that they will take steps to cancel end-of-year events and move winter exams online amid a surge in COVID-19 cases on their respective campuses.

"Given that we've seen an uptick in cases among undergraduates during the last 24 hours -- including suspected cases of the highly contagious Omicron variant -- we hope to avoid letting the final exam schedule interfere with students’ travel home for Winter Break," Princeton University's dean, Jill Dolan, and vice president for campus life, Rochelle Calhoun, said in a joint statement. "We certainly don’t want you remaining on campus in required isolation through the holidays."

All indoor gatherings with food and those where face coverings cannot be worn must be canceled or postponed at Princeton's New Jersey campus from Thursday through Jan. 7, according to the statement.

A statement from New York University's provost, Katherine Fleming, executive Vice President, Martin Dorph, and head of the COVID-19 prevention and response team, Dr. Carlo Ciotoli, said they "strongly encourage that final examinations and/or assessments be changed to remote/online format." All discretionary, non-essential, non-academic gatherings and events at the school's campus in New York City must be canceled "immediately," according to the statement.

"The continuous review of the data from our COVID-19 testing program has indicated a considerable acceleration in the rate of new cases in our community," they said. "It’s not a cause for alarm, but it is a cause for concern, caution, and appropriate actions."

NYU has also joined a growing list of colleges and universities across the nation that are requiring all eligible members of the school community, including faculty and students, to be fully vaccinated against COVID-19 and receive a booster shot ahead of the upcoming spring semester.

Meanwhile, officials at Cornell University in Ithaca, New York, announced Tuesday that they have moved the campus into a "level red" alert after identifying evidence of suspected cases of the omicron variant in a "significant" number of the school's COVID-19 positive samples from students.

According to data from the Centers for Disease Control and Prevention, the omicron variant is estimated to account for more than 13% of newly confirmed COVID-19 cases in the New York and New Jersey area -- the highest proportion of any region of the United States.

-ABC News' Chris Donato and Arielle Mitropoulos