Child Covid-19 hospitalizations reach a new high. That’s not the only reason kids need to be protected from Delta, doctors say

More kids were hospitalized with Covid-19 this month than any other time this past year – proving how seriously the Delta variant can hit any age group.

Between August 20 and 26, an average of 330 children were admitted to hospitals every day with Covid-19, according to the US Centers for Disease Control and Prevention.

Dr. Michael Nguyen tends to a patient in a hallway at the Houston Methodist The Woodlands Hospital on August 18, 2021 in Houston, Texas. Across Houston, hospitals have been forced to treat hundreds of patients in hallways and corridors as their emergency rooms are being overwhelmed due to the sharp increase in Delta variant cases. Hospitals are straining to keep up with the surge of new coronavirus patients as schools and businesses continue to reopen. Houston has seen an upward increase in Delta infections, and research is showing the Delta variant to be 60% more contagious than its predecessor the Alpha variant, also known as COVID-19.

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That’s the highest rate of new Covid-19 hospitalizations among children in more than a year – a record that was broken several times in August, according to CDC data.

“This virus that we’re dealing with now is a game changer,” said Dr. Mark Kline, physician-in-chief of Children’s Hospital New Orleans.

“It’s just so easily transmitted from person-to-person.” As of August 9, he said, “half of the children that we’ve admitted have been under the age of 2.”

Doctors say it’s crucial to protect children against the Delta variant – not just for the sake of their health and to keep in-person learning, but also to help prevent more aggressive variants from setting the entire country back.

204,000 new pediatric cases in one week

Since the last school year, a more contagious variant – Alpha – has been replaced by an even more contagious variant – Delta – as the dominant strain of coronavirus in the US.

Baton Rouge children's hospital

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In just two months, Delta jumped from 3% to more than 93% of sequenced coronavirus samples in the US, the CDC said.

Now, Covid-19 cases among children have “increased exponentially,” the American Academy of Pediatrics said Tuesday.

During the week ending August 26, about more than 200,000 new childhood Covid-19 cases were reported, the AAP said.

That’s a “five-fold increase the past month, rising from about 38,000 cases the week ending July 22nd to nearly 204,000 the past week.”

Among kids getting hospitalized with Covid-19, many were previously healthy.

Almost half – 46.4% – of children hospitalized with Covid-19 between March 2020 and June 2021 had no known underlying condition, according to CDC data from almost 100 US counties.

MIS-C and long Covid can leave lasting impacts

Long-term Covid-19 complications can be significant for children – even for some who initially had mild or no symptoms, the American Academy of Pediatrics said.

All pediatric patients who tested positive should have at least one follow-up exam with a pediatrician, the AAP said.

Pediatricians should watch out for residual or long-term Covid-19 problems such as respiratory symptoms, which can last three months or more; heart issues, including a type of heart inflammation known as myocarditis; cognitive problems such as “brain fog”; headache; fatigue and mental health issues, the AAP said.

Joeyanna Hodnett dreams of playing in the WNBA. For the last six months, however, she has been sidelined by long-haul Covid-19, with no obvious end in sight. CNN blurred the team name on the image on the left, per a request from her mother.

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Children who had moderate or severe Covid-19 may be at greater risk for subsequent heart disease, the pediatrician group said.

In some cases, children who start with mild or even no symptoms from Covid-19 end up hospitalized weeks or months later with a condition called MIS-C – multisystem inflammatory syndrome in children.

MIS-C is “a rare but serious condition associated with COVID-19 in which different body parts become inflamed, including the heart, lungs, kidneys, brain, skin, eyes, or gastrointestinal organs,” the CDC says.

It happens when “the virus induces your body to make an immune response against your own blood vessels” – which can cause inflammation of the blood vessels, said pediatrician Dr. Paul Offit, director of the Vaccine Education Center at the Children’s Hospital in Philadelphia.

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Often, children with MIS-C don’t start off very sick with Covid-19.

“Usually children are picked up incidentally as having (coronavirus). Someone in the family was infected, a friend was infected, so they got a PCR test. And they’re found to be positive. … Then they’re fine,” Offit said.

“Then a month goes by, and they develop a high fever. And evidence of lung, liver, kidney or heart damage. That’s when they come to our hospital.”

At least 4,404 cases of MIS-C had been reported between February 2020 and July 2021, including 37 deaths, the CDC said.

It said 99% of MIS-C patients had tested positive for coronavirus, and the other 1% had contact with someone with Covid-19.

The median age of patients with MIS-C was 9 years old.

People enter Disneyland Park as it reopens for the first time since the COVID 19 pandemic forced the park to shut down last year on April 30, 2021 in Anaheim, California.

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“CDC is working to learn more about why some children and adolescents develop MIS-C after having COVID-19 or contact with someone with COVID-19, while others do not,” the CDC says.

“Based on what we know now about MIS-C, the best way you can protect your child is by taking everyday actions to prevent your child and the entire household from getting the virus that causes COVID-19.”

The best steps parents can take include getting vaccinated and vaccinating children ages 12 and up, CDC Director Dr. Rochelle Walensky said.

And even if a parent is fully vaccinated, there’s a small chance they could catch an asymptomatic breakthrough infection and pass the virus to their children.

That’s why it’s a good idea for all parents of young children to wear masks in public indoor settings, Walensky said.

But the best way to protect unvaccinated children, she said, “is to surround them with vaccinated people.”

Protecting kids from Covid-19 is critical to keep them in schools

With the highly contagious Delta variant, the CDC recommends students from kindergarten through grade 12, along with teachers and visitors, wear masks in school.

The American Academy of Pediatrics recommends masks in schools for everyone older than 2.

“Our children deserve to have full-time, in person, safe learning with prevention measures in place. And that includes masking for everyone in schools,” Walensky said.

Masked school children wait to have their portraits taken during picture day at Rogers International School on September 23, 2020 in Stamford, Connecticut.

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Some students are returning to schools for the first time in a year. But long-awaited classroom learning can be quickly derailed by an infection or outbreak.

In Mississippi and Florida, thousands of students just starting their school year have already had to quarantine.

And it doesn’t take much for Covid-19 to shut down a school again. Even one case can have a ripple effect on students, faculty and staff.

“We need adults to run schools, and if my adults are sick or needing to quarantine, I don’t have adults present to provide the education,” said Carlee Simon, superintendent of Alachua County Public Schools in Florida.

A student's name is written on a desk as a teacher sets up her classroom at Freedom Preparatory Academy as teachers begin to prepare to restart school after it was closed in March due to COVID-19 on August 13, 2020 in Provo, Utah. The school is planning to have students return on August 18 for five days a week instruction, but with reduced hours during the day.

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“When we have families that don’t want to have masks on their child, what they’re doing is not only (increasing the) chance they will have to be quarantined,” Simon said.

If a student gets infected, “they will also have other students who did have masks on who would also need to be quarantined.”

“Everybody wants to move forward. Nobody wants to have masks forever,” Simon said. But “we would like to be able to be safe and have instructional time with our students.”

In addition to masks in schools, the CDC recommends layering other strategies such as improved ventilation, physical distancing and testing on a screening basis.

Children can accidentally help spur new variants

Protecting children from getting Covid-19 can help everyone in the long run, doctors say.

As coronavirus keeps spreading, replicating itself in new people, the more chances it has to mutate – potentially leading to even more contagious variants or one that might evade vaccines.

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“That’s, of course, the concern,” Walensky said.

Fully vaccinated people are less likely to get infected with the Delta variant.

But unvaccinated people – including unvaccinated children – are more susceptible to infection. And they can unknowingly help with the creation of new variants, Offit said.

“If we are going to continue to allow this virus to spread, we’re going to continue to allow these variants to be created,” he said.

“We’re not going to be able to stop this pandemic until we have a significant percentage of the population vaccinated.”

Covid-19 deaths in children shouldn’t be ignored, CDC chief says

While children are far less likely to die from Covid-19 than adults, the deaths are still significant, Walensky said.

A father leading his daughters into the first day of school at an elementary school in Brooklyn, Sept. 21, 2020. They were turned away and told school would start next week for grade levels. (Kirsten Luce/The New York Times/Redux)

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At least 496 US children have died from Covid-19, according to CDC data. For the 2019-20 flu season, the CDC reported 199 confirmed pediatric flu deaths and an estimated 434 pediatric flu deaths.

One reason Covid-19 is deadlier for children than other infectious diseases is because many children are vaccinated against other diseases, said Dr. James Campbell, professor of pediatrics at the University of Maryland School of Medicine.

“Nobody’s dying of polio, nobody’s dying of measles in the United States. Nobody’s dying of diphtheria,” Campbell said.

But while children ages 12 to 17 can get a Covid-19 vaccine, many have not done so. And it could be several more months before a vaccine is authorized for children younger than 12.

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Rebecca Calloway’s 7-year-old daughter, Georgia, is one of thousands of young children testing various doses of Covid-19 vaccines to make sure they’re safe and effective before they get authorized.

Part of the reason Calloway enrolled Georgia in the pediatric vaccine trial is because she recently lost her 3-year-old daughter to another unexpected disease – Type 1 diabetes – and doesn’t want any more families to lose a child to Covid-19.

While childhood deaths from Covid-19 and Type 1 diabetes are rare, Calloway said, “You don’t want to be that statistic.”

CNN’s Deidre McPhillips and Jen Christensen contributed to this report.