Updated January 3, 2022 at 7:05 PM ET

As the coronavirus pandemic slides into a fifth school semester, there is less appetite than ever among U.S. leaders for schools to go remote, even though cases — and with them, pediatric hospitalizations — are rising. According to Burbio, an organization that tracks individual school and district websites, the vast majority of U.S. schools are staying open for in-person learning this week.

Still, Burbio reports that at least 3,229 schools around the country announced they were canceling in-person learning as of Monday evening. Some announced closures for one week. That includes Atlanta and Fulton County in Georgia and Ann Arbor, Mich. Others are closing for two weeks, including schools in Newark, Paterson and Elizabeth, N.J.; Mount Vernon, N.Y.; Pontiac, Mich.; and Prince George's County, Maryland.

Most districts cited rising cases, but school leaders in Greendale, Wis., told families they simply had too many staff members in quarantine to keep the district open on Monday, and Pittsburgh is also closing a dozen individual schools due to staffing shortages.

Leaders are determined to keep schools open

Around the country, mayors, governors and the U.S. secretary of education have been speaking forcefully in favor of keeping schools open.

"Our expectation is for schools to be open full time for students for in-person learning," Education Secretary Miguel Cardona said on Fox News Sunday.

Meanwhile, some teachers unions are pushing for delays and stronger safety measures. Some parents and students are worried too.

Kathryn Rose, a substitute teacher in Chicago Public Schools, was teaching at a high school on Monday. She says, "We opened class talking about how [the students] felt about being in the building. Many of them said they did not feel safe."

Chicago's teachers union is set to vote Tuesday on whether to begin teaching remotely Wednesday — without the city's permission.

New York City, home to the largest school district in the country, is reporting about 31,000 cases a day. The head of the city's teachers union, Michael Mulgrew, said in an open letter on Sunday that he advised the mayor that a temporary return to remote learning would be the safest course of action.

No dice. Mayor Eric Adams, who was sworn in on New Year's Day, started his first Monday in office with a news conference held at an elementary school in the Bronx. "We are really excited about the opening of our schools," he said. "And we want to be extremely clear: The safest place for our children is in a school building, and we are going to keep our schools open."

Schools are turning to vaccines, altered quarantines and tests, tests, tests

Compared with previous semesters, some schools are adjusting how they use vaccines, tests and masks to keep schools open safely.

Vaccines are available for children as young as 5 years old. The Food and Drug Administration has also authorized booster shots for certain immunocompromised children ages 5 to 11 and for all children 12 to 17 years old. New Orleans is in the vanguard among districts in announcing a vaccine mandate for students as young as 5 years old, to take effect in February.

Schools are also increasingly relying on rapid tests, which produce results in as little as 15 minutes. These can be used both for detecting cases and for keeping children in school after an exposure, under a protocol that the Centers for Disease Control and Prevention calls "test to stay." California's governor has said the state will send 6 million of these tests to schools. New York state officials are sending 3 million to 3.5 million, with 2 million tests to schools in New York City. Connecticut is providing 2 million tests to schools, and Massachusetts more than 227,000.

While these numbers are large, they are nowhere near enough to test everyone multiple times a week, which is the protocol adopted at some workplaces and private schools.

Public health experts are also advising people to upgrade their masks. Los Angeles County is telling school staff to use medical-grade masks, and New York City officials have said they will provide KN95 masks for school staff. But there have been few calls to replace cloth masks among students. And more than a third of districts in Burbio's sample of 500 large districts had no mask mandate at all.

Even where there are mask mandates, two enduring concerns are high school athletics — especially sports like wrestling — and lunchtime. Dr. Danny Benjamin of the ABC Science Collaborative, which advises districts on safety protocols, says, "There's going to be a considerable amount of spread at lunch if people aren't careful with omicron."

While the experts make their recommendations, Kathryn Rose, who is six months pregnant, says she will continue going to the classroom. So will her three children, all in Chicago Public Schools.

"Turn the air purifier up to turbo, wear your mask. I feel that it's important to put students in rooms together, talking and laughing and asking questions."

She says it's a calculated risk.

Joe Palca's reporting appears in the audio version of this story.

Copyright 2022 NPR. To see more, visit https://www.npr.org.

Transcript

AUDIE CORNISH, HOST:

Today the FDA authorized COVID booster shots for kids ages 12 to 15. The decision comes as many children are heading back to school after the holidays. Parents and school districts across the country are grappling with decisions about how to balance education with the surge in COVID cases driven by the omicron variant. Now here to talk more about the latest developments are NPR's Joe Palca and Anya Kamenetz. Welcome to you both.

ANYA KAMENETZ, BYLINE: Thank you.

JOE PALCA, BYLINE: Hi there.

CORNISH: I want to start with you, Joe, about what the FDA is trying to accomplish by extending boosters to children as young as 12.

PALCA: Well, the FDA is really pulling out all the stops because of omicron. They'd like to figure out anything they can to help blunt its march across the country. But the booster is likely only to have a modest impact on preventing transmission of disease. I spoke to Flor Munoz. She's a pediatric infectious disease physician at Texas Children's Hospital. She was actually in the vaccine clinic when I spoke with her, and I asked her about the impact she thought boosters would have for children 12 to 15.

FLOR MUNOZ: I think the hope is that it will prevent severe disease. I think that we don't really expect that there will be a prevention of transmission or even a prevention of infection altogether.

PALCA: So kids that age will be eligible for a booster five months after completing the initial round. And remember; the authorization for kids this age came last May. So many children are five months out.

CORNISH: I want to ask also about children younger than 12. What's going on there?

PALCA: Yeah. The FDA authorized a third dose for children 5 to 11 with immunodeficiencies. Now, that's not really considered a booster, just the number of vaccines needed to get an initial adequate immune response for immunocompromised children that age. But they are authorizing a third dose for children who aren't immunocompromised. And you have to remember that vaccines for children 5 to 11 were only authorized in November. I spoke with Yvonne Maldonado, professor of global health and infectious diseases at Stanford University.

YVONNE MALDONADO: It would be great, actually, if we could vaccinate all kids 6 months and older and boost the younger kids as well, but we don't have the data for those kids.

PALCA: Now, there was some news recently that two shots of the Pfizer vaccine did not seem to generate a good response in children 2 to 4. So they're studying a third dose for those children - again, not a booster, just a normal schedule requiring three shots. And there's also data showing that children 6 months to 2 years might only need two shots.

CORNISH: I want to bring in Anya Kamenetz in a moment. But first, Joe, I understand the FDA has shortened the amount of time between kind of vaccination and booster for folks over the age of 12. Can you give us a little clarification on that?

PALCA: Well, clarification - sort of. The agency says it has - now has good data for that age group, and five months is an adequate interval. But it's left a pretty complicated playing field. If you listen to Janet Woodcock, she described it at a press conference. She's the acting commissioner of FDA.

(SOUNDBITE OF ARCHIVED RECORDING)

JANET WOODCOCK: If you got J&J, you get a booster after two months. If you got Pfizer as your primary series, you can get a booster at five months. If you got Moderna, you could get a booster at six months or beyond.

PALCA: So, again, the idea here is trying to make sure parents stay healthy and don't transmit the virus to their kids and vice versa.

CORNISH: Anya, here's where school districts have to kind of parse this information and data as well, right? I mean, how are they responding to this surge with this variant, omicron, as students are returning from winter break?

KAMENETZ: So at least 2,750 schools around the country have gone virtual this week, most for one week, some for even two weeks. And those are concentrated in the Northeast and Upper Midwest. And that's according to the latest from Burbio, a website that tracks what schools are doing. That includes dozens of district-wide closures. Of course, Audie, if you do the math, that means the vast majority of school leaders around the country are keeping classrooms open but not without some uncertainty and some tension right now.

CORNISH: What does that tension look like?

KAMENETZ: So in Chicago and New York City, for example, teacher unions are really pushing to up safety measures. Chicago's teacher union met last night virtually, and they are going to vote on whether to begin teaching remotely Wednesday without the city's permission. And in New York City, you know, the health department is currently reporting about 31,000 cases a day here. This is the largest school district in the country. Parents are really wondering, is it safe to send their kids to school? They're texting each other, posting on Facebook, are you sending your kids to school?

And the head of the city's teacher union, Michael Mulgrew, advised the mayor that a temporary return to remote would be the safest course, but it was no dice. This is Mayor Eric Adams. He took office January 1, and he started his first Monday in office with a press conference held outdoors at an elementary school in the Bronx. And with his very first words, he underlined, you know, the safest place for our children is in a school building, and we are going to keep our schools open.

CORNISH: Let's take this beyond New York City for a moment. How are other school districts handling it?

KAMENETZ: Yeah. So schools are increasingly relying on rapid tests not only to find cases but to keep children in school after an exposure. And that's the protocol the CDC calls test-to-stay. So California announced they're sending out 6 million rapid tests to schools; New York state, 3 to 3.5 million; Connecticut, 2 million; Massachusetts, around 227,000. But that's one batch. You know, they're going to need a steady supply of these tests going forward.

Then we're hearing in places like Los Angeles County about upgrading masks, at least for staff. But on the other hand, Burbio says more than a third of the country's biggest districts don't require masks at all. And even when there are mask mandates, two enduring concerns right now are lunchtime and high school athletics, especially when there's spectators.

So with all of this, Audie, the real possibility is that as omicron rips through, staff will be calling out sick. And that's going to close schools unpredictably with these rolling closures rather than superintendents or mayors actually making the call to go remote.

CORNISH: And, Joe Palca, can school districts soon rely on boosters - right? - to be kind of another tool in the kit here?

PALCA: Yeah. That's the way to think of it - another tool. But it's not going to solve the problem. And these boosters aren't going to be available at least for a few days anyway because there's an advisory committee to the CDC that's going to meet on Wednesday. And it'll be after that most likely that the CDC's recommendation for who should get these boosters will come out. I talked with Yvonne Maldonado about this, and she says boosters will help. But what would be really helpful is an at-home COVID test that kids could take every morning.

MALDONADO: Just a simple little swab and just check and see if the child's infected or not. And then they can go to school feeling safe, and everyone else around them can feel safe as well.

PALCA: And as Anya said, there's a lot of these tests going to schools, but it's not enough right now. Maybe there will be soon.

CORNISH: That's NPR's Joe Palca and Anya Kamenetz. Thank you both for this reporting.

KAMENETZ: Thank you.

PALCA: You're welcome. Transcript provided by NPR, Copyright NPR.

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