UAE: Will children spread COVID-19 when they go back to school?

How safe it is for children to return to school while the coronavirus is on the loose?

That depends on what's likely to happen if a student becomes infected. Will the virus jump to his classmates, who could then fuel its spread throughout the rest of the school? Will it find its way to his teacher and hitch a ride to the staff room, putting the rest of the teaching staff at risk as well?

Scientists don't have definitive answers to questions like these, and they probably won't for quite a while.

Educational institutions across the world are coping with this uncertainty in different ways. While Cambridge University in the UK was quick to announce that all of its lectures would remain online until Summer 2021, the Knowledge and Human Development Authority (KHDA) in Dubai has said that schools will be returning in September and has published an extensive list of hygiene requirements and practical guidelines for schools to follow on reopening in the autumn. These guidelines include the requirement that all staff and children aged 6 and older must wear a mask at all times (apart from when eating and during intense physical activity), and that a physical distance of at least 1.5m is maintained between children in all classroom environments, or 2m in all common areas.

When it comes to implementing the guidelines, different schools will have to cope in different ways depending on their facilities. “Some schools may hold more outdoor classes to maintain physical distancing, while others may continue to offer online learning to some students,” says the KHDA. While it may be business as usual for schools that have enough capacity to follow the social distancing guidelines, smaller schools may have to adapt by alternating in-person and distance-learning days for example.

A report released Wednesday by the National Academies of Sciences, Engineering, and Medicine acknowledges the bind schools and educational authorities across the world are in.

"There is insufficient evidence with which to determine how easily children and youth contract the virus and how contagious they are once they do," the report says. This knowledge gap "makes it extremely difficult for decision-makers to gauge the health risks of physically opening schools and to create plans for operating them in ways that reduce transmission of the virus."

But decisions must be made anyway, and we do need to aim to return to some kid of normality, albeit with precautions in place. Here's a closer look at what scientists do know about kids and COVID-19 and what it suggests about the risks of sending them back to school.

They do seem to be less susceptible to the virus, and that's especially true for younger children.

Data from the U.S. Centers for Disease Control and Prevention show that, until May 30, the incidence of COVID-19 was 51.1 cases per 100,000 children under 10 and 117.3 cases per 100,000 kids and young adults between the ages of 10 and 19. Both of those figures were well below the nationwide figure of 403.6 cases per 100,000 Americans.

Scientists aren't sure what accounts for this phenomenon. One theory is that children's cells have fewer of the ACE2 receptors that the coronavirus needs to bind to in order to initiate an infection. Researchers analyzed the level of ACE2 gene expression in 305 people between the ages of 4 and 60 and found that it increased steadily with age.

"Lower ACE2 expression in children relative to adults may help explain why COVID-19 is less prevalent in children," the researchers reported in the Journal of the American Medical Association.

But that doesn't mean kids can't get sick. Indeed, a small number of pediatric patients have developed a serious disease called multi-system inflammatory syndrome, or MIS-C, in children.

"While the balance of the data shows that kids are less susceptible to infection and less likely to transmit it, less susceptible doesn't mean they're not susceptible," says Dr Scott Gottlieb, former commissioner of the Food and Drug Administration.

Probably. After all, you can't spread a virus if you don't have it in the first place.

Some health experts suspect that one reason infection rates have been lower in kids than adults is that they've been relatively isolated at home while their parents have left the house to work, shop or socialize. Once kids are back in school, they might start to catch up.

There is some evidence that kids just don't have the same coronavirus-spreading power as adults. Studies that tracked how infections spread through households in the U.S., Switzerland, and several countries in Asia have shown that adults are far more likely than kids to bring the virus into their homes, said Dr. Naomi Bardach, a pediatrician and policy researcher at the University of California, San Francisco.

"Most often, the adult in the household was the one who was originally infected," added Dr. Ibukun Christine Akinboyo, medical director of pediatric infection prevention at Duke University Medical Center. "If it was the child, there seemed to be a less than 15% risk that the child would transmit across the household."

However, a large new study from South Korea published on July 16 has caused some alarm as it suggests that children over 10 can be just as infectious as adults, while tweens and teens can spread it even more rapidly than adults. The findings suggest that as schools reopen, communities will see clusters of infection take root that include children of all ages, several experts caution.

Read more: Older kids spread coronavirus just as much as adults

No. For one thing, infection rates are lower for primary school-age kids than for teenagers.

Another consideration is that secondary school students can do more to protect themselves than young children. For instance, they should be able to wear a mask the whole time they're on campus, something FS1/FS2 kids and kindergartners probably can't handle. Older students ought to be better at social distancing as well.

And when they get home, high schoolers can operate more independently than elementary school kids. That could help mitigate the risk that a teenager, if infected, would pass the virus along to family members at home, said Dr. Charlene Wong, a pediatrician who also studies health behaviors at Duke University.

Paediatricians recognize that younger kids may not wear masks at all times, stay apart from their classmates, or keep their hands away from their faces. But since they're less vulnerable to infection, that's probably OK, they said.

Data from the Netherlands back up the idea that "children play a minor role in the spread of the novel coronavirus," said Dr. George Rutherford, an infectious diseases expert at UCSF.

That country allows children up through the age of 12 to get close to both kids and adults without having to worry about social distancing, he said. Even teens ages 13 to 17 can be in close contact with each other. But since adults account for the bulk of viral spread, they need to stay at least six feet away from each other whenever possible.

Meanwhile in the UAE only children aged six years and over are required to wear a face mask.

Generally speaking, not much. For example:

However, although no significant coronavirus outbreaks have been traced to schools, that doesn't mean it couldn't happen in the future. Additionally, in China and South Korea schools were reopened, only to have to close again as the countries fight subsequent waves of the virus. 

It seems like the answer ought to be yes, but it might have helped less than you'd think.

Several studies have tried to quantify the benefits of measures aimed at slowing the spread of the coronavirus, including quarantines, stay-at-home orders, school closures and social distancing policies. Together, these policies did seem to impede transmission of the virus, though by how much isn't clear.

One preliminary study that focused on Hong Kong found that measures aimed at keeping people apart may have reduced community spread by as much as 44%, but the authors did not estimate how much of that benefit could be attributed to closing schools.

A review in the journal Lancet Child and Adolescent Health turned up only one study that used models to estimate the impact of school closures on community health. Members of the Imperial College COVID-19 Response Team calculated that if all primary and secondary schools were closed, along with 25% of universities, COVID-19 deaths in the United Kingdom would be reduced by 2% to 4%. In part, those numbers are low because the benefit of keeping children out of school was offset by a 25% increase in their time spent in the community, not to mention a 50% increase in close contact with family members.