‘This virus is behaving differently’: Experts weigh how NYC should protect schools against COVID this fall

Mayor Bill de Blasio Chancellor Porter will join school leadership at Phyl’s Academy in Brooklyn to announce 3K for all and visit Pre-K students in class March 23, 2021. Michael Appleton/Mayoral Photography Office
As the fall approaches, families and educators are still in the dark about the city’s COVID protocols for schools. (Michael Appleton / Mayoral Photography Office)

One of the biggest questions on the minds of New York City’s public school families, principals, and teachers is what COVID precautions will look like at schools this fall. 

This school year is set to be far different from either of the last two. Hybrid learning is gone, and the city is planning to welcome every child back to their school building on Sept. 13. But even with the first day a month away and a highly transmissible COVID variant sweeping through the five boroughs, city officials have not yet informed families and educators about social distancing, in-school testing, and quarantine policies. 

State health officials announced Thursday that, unlike last year, they wouldn’t offer any guidance for this fall. Frustrated by the delay and eventual punting on the matter from Gov. Andrew Cuomo’s administration, state education officials have advised districts to use federal school reopening guidelines as a basis for their plans. 

Chalkbeat spoke to three experts who have followed COVID-19 closely — Susan Hassig, assistant professor of epidemiology at Tulane University; Morgan Philbin, assistant professor of sociomedical sciences at Columbia University; and Cynthia Leifer, professor of immunology at Cornell University — about the best ways to protect children and educators at school based on what is known so far about the delta variant. 

They agreed that getting vaccinated is the best possible protection against COVID-19, since vaccinated people are shown to be far less likely to become infected and rarely develop severe illness or die. The city saw an average 127 new cases per 100,000 people over the past week, which poses “high” risk of transmission within schools, according to the U.S. Centers for Disease Control and Prevention.

But with the delta variant in the mix, vaccinated people who do get COVID can still spread it – though potentially for just a short amount of time — which can be problematic for children 11 years old and younger who are not yet eligible for a shot. That means schools should use layers of protection to stymie virus spread, these experts said.  

About 60% of city teachers have been vaccinated, but that figure is likely higher since many teachers may have been jabbed outside of New York City, officials said. Teachers will also be required to get vaccinated before the start of school or get tested weekly. As of this week, about 43% of New York City children ages 12-17 have received at least one dose. City officials are hoping to boost those numbers through a vaccination campaign this month. 

The experts said there is not yet good evidence about how the delta variant affects unvaccinated children, but all three said infected children are still usually showing mild symptoms. Hospitals in several states have reported seeing more COVID-related pediatric hospitalizations. As of late July, the CDC reported that children ages 5-17 were just as likely to get infected as older age groups but were among the least likely to be hospitalized or die. While infections have grown among children ages 0-17, they were still among the lower half of case rates per 100,000 people in the United States this week, according to federal data.

After vaccines, the most important protection is universal masking, experts said, which Mayor Bill de Blasio has already committed to. Social distancing and good ventilation come next. The education department is promising two air purifiers for every classroom and has been working to fix faulty ventilation systems.

But all of these protections — also recommended by the CDC — must be coupled with quarantining and closure policies, these experts believe. While infection rates remained very low in New York City schools last year, just about 40% of children attended in person by the end of the school year. 

“I do believe it’s better for the kids to be in person, but I think the entire system — the parents, the policymakers, everybody — needs to recognize that this virus is behaving differently than the other virus that we had experience with the last time kids were in school,” said Hassig, who specializes in infectious disease outbreaks. 

Social distancing

Last academic year, schools were required to maintain six feet of distance between students for most of the year. That was reduced in the spring to three feet for younger grades after the U.S. Centers for Disease Control and Prevention loosened some of its guidelines. 

This year, New York City schools can implement three feet of distance in their buildings if possible, but it won’t be required, according to guidance shared with administrators on Thursday from the city principals union. That’s in line with CDC recommendations that call for such distancing but not at the expense of fully reopening buildings. 

Hassig, Philbin, and Leifer said distancing is still an important factor in limiting virus spread, but less key than keeping masks on and boosting vaccination rates. If schools cannot keep students apart because of space constraints, Hassig suggested they limit gathering in areas where masks come off, such as a cafeteria. She suggested, if possible, having children grab food and eat in classrooms, or have children alternate days that they eat in the cafeteria — but she acknowledged this can be difficult in buildings that are strapped for space.

Hassig thinks cloth masks will offer enough protection, but they should be tightly fitted and worn over the nose at all times. Teachers and classroom aides should make sure students are wearing masks correctly, she said.

Leifer emphasized that there’s a careful balance between implementing every possible anti-virus recommendation and keeping children out of school. 

“We need students back in person, and if they can’t be three feet or six feet apart, if we have these other protections in place, they’re going to be reasonably safe,” Leifer said. 


Classroom and building closures were highly debated last year, when just two unrelated virus cases caused whole schools to shut down. That policy, which public health experts called overly conservative, resulted in frequent two-week closures that disrupted stability for children, working caregivers and teachers. City officials later changed their policy to close buildings only when there are positive cases in four separate classrooms, but still to close individual classrooms with at least one infected person. 

During summer programs, vaccinated people without symptoms did not have to quarantine if a classroom or the building closed. Just .2% of in-school tests have come back positive over the course of the summer. But as of Friday, 247 classrooms were closed, with no buildings currently closed.

All three experts agreed that classrooms and buildings should close if there are positive cases since many children will not have been vaccinated, and while children may be less likely to get sick, they could take it home to more vulnerable family members. Without any such rules, virus spread could “go unchecked,” particularly because so many children can’t get vaccinated, Leifer said. But they also agreed that there is no “magic” policy that will perfectly limit spread.

“If rates are incredibly low in one neighborhood and incredibly high in another, coupled with vaccination rates, the risk is so much different,” Philbin said. “Our goal is to catch every person as early as possible so that they don’t transmit further, particularly among an unvaccinated population.”

Philbin believes the city should consider tailoring building closure rules for schools based on their vaccination rates, coupled with the surrounding neighborhood’s vaccination and infection rates. That’s because communities with low virus spread are less likely to see spread inside of schools, on top of the fact that vaccinated people are far less likely to become infected, she said. 

For example, schools in neighborhoods with higher vaccination rates — such as in the 50% to 60% range — and low infection rates could close buildings under the city’s current four-classroom policy, she said. But it may be smarter for schools in neighborhoods with lower vaccination rates and high COVID caseloads to close sooner, since the dominant delta variant is highly contagious. 

It’s important to note that many schools where students may be attending come from other neighborhoods or boroughs. And this could raise equity issues in a city where neighborhoods with lower vaccine rates and higher coronavirus rates tend to be lower income and with more people of color. 

Because of how contagious this new variant is, Hassig believes it won’t take long for “a domino effect” of infections once a case has been identified if mitigation measures aren’t taken seriously and students are mingling with each other a lot, especially unmasked.  

Additionally, Hassig and Philbin believe vaccinated people should still be required to quarantine for at least some period of time, contrary to the city’s closure policy and CDC guidance right now. While vaccinated people are far more protected from the virus, early studies show they can still carry as much virus as the unvaccinated, even if it’s for a shorter amount of time. Hassig suggested that when a classroom is closed, vaccinated people could be allowed back to school after they get a negative COVID test two to three days after they started quarantining. 


Last school year, officials initially required monthly testing of 20% of students and staff then bumped it to a weekly routine in December 2020 after schools were closed amid a rise in COVID cases. 

For summer programs, 10% of students and staff at each site are tested every other week, with a larger portion tested when positive COVID cases pop up. Just 69 tests of more than 36,000 so far came back positive, city data show. But in areas like New York City where transmission is considered moderate or higher, the CDC recommends offering testing at least weekly to unvaccinated students and staff.

All three experts believe there should be some level of in-school testing because that will be key to catching and isolating positive cases, including among asymptomatic people who can still spread the virus. 

Hassig believes the city should start with weekly random testing of 20% of students and staff. That could be a huge logistical and financial burden given New York City’s size, but it will be key for “trying to keep a handle” on virus spread, Hassig said. 

She also believes that if a classroom closes due to a positive case, there should be additional testing of people in the surrounding rooms because those people “are more likely to have mingled.”

“If you’re finding a lot of cases at 20%, it would suggest there are probably more,” she said. 

Similar to her idea about building closures, Philbin believes the rate of testing could also depend on a school’s vaccination and infection rates, and be more frequent in elementary schools with children who aren’t yet eligible for vaccines. 

Correction: This story initially said New York City’s COVID transmission level was moderate as defined by the CDC. The current levels are considered high transmission.

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