What does Delta Variant mean for Kids and Covid?


It’s done said countless times by public health figures and politicians, and in magazines like this, that Covid-19 is now a pandemic without a vaccine. The line is easy to write, because it’s real. Successful infections among the vaccinated are an issue, the virus roaring at the edges of our collective resistance. But severe illness and death were almost entirely among those who had not yet been shot.

But who are those non -walking people? Increasingly, they are the child. The largest group is young children, those under 12, because no vaccine is allowed for them. But the photo isn’t much better with older kids. Only a third of children ages 12 to 15 in the U.S. are fully vaccinated, according to the numbers gathered at the Centers for Disease Control and Prevention, and the number remains below the average for people approaching the age of twenty. So it’s no surprise that 22 percent of U.S. cases were reported in the third week of August, 180,000 in all, diagnosed in children, up from 14 percent of the total since the start of the pandemic. That weekly number is double what it was at the start of the month, and that puts the screening of child units across the U.S., especially in areas where the Delta is in turmoil.

“When people started to drop their masks and re-associate, that’s when we saw our launch,” said Abdallah Dalabih, a critical care physician at Arkansas Children’s Hospital. , where Covid-19 claims in the state’s only pediatric ICU surged in August and remain so. stubborn.

“We all thought we were done with Covid, so unfortunately it didn’t stop people from a lot of interactions this summer,” said Kofi Asare-Bawuah, a pediatrician at CoxHealth in Springfield, Missouri. . The Ozark region, which saw one of the first Delta jumps in the U.S. in July, also now sees a increase in MIS-C cases, the inflammatory immune condition that occurs in some young people weeks after their infection. In recent weeks, Asare-Bawuah’s group has sent three children with life-threatening cases to be treated at a larger hospital in St. Louis.

This is a frustrating reality, according to David Fisman, an epidemiologist at the University of Toronto, and one that contradicts the narrative that the pandemic must end. “We’re all sick of it,” he said, stopping to recognize someone with a sympathetic eye across the room from his 9-year-old daughter, who was also tired of hearing about the pandemic. This is also a confusing reality. The pandemic rules that were planted 18 months ago went something like this: Children and less vulnerable are meant to stay home and be careful to protect the elderly and those with pre-existing health conditions. This understanding stems from the silver lining of the pandemic: that young people are less likely to develop serious illness that can lead to hospitalization or death – an uncommon pattern for respiratory illness, which often affects children as well as the elderly.

Experts like Fisman are concerned that fatigue and lack of emphasis on children’s risks lead to less caution such as increased transmission in children. “I think there’s a lot of concern about self -risk in older people,” he said. Maybe we dropped our guards a little too quickly, and it was time for some kind of calibration. Here are some things to know:

Why does the virus not affect children as much as adults?

In recent months, researchers studying the immune system have begun to feel more confident in specific explanations. One difference is that children appear to have a more prepared immune system when Covid-19 infection begins. That resistance response begins with the production of antiviral proteins called interferon, which recruit a battalion of immune cells all the way to the nose, explains Kerstin Meyer, a chief scientist on the Wellcome staff. Sanger Institute. who studied the difference between adult and child responses. In older people, a feature of Covid-19 infection is that these initial warning signals are often suppressed, preventing the vital early response from healing. This allows the virus to multiply quickly in the long airways and then spread deep into the lungs, where it causes more severe disease. But in children, “this viral sneakiness is suppressed,” Meyer said. The cells of the nose and throat show more prevalence to speed up the response, so the infection usually ends before any more than mild symptoms show up.

But what if it’s not put on the butt? Children still show advantages. The natural resistance response is later joined by an adaptive trend – a force that recruits and multiplies specific cells, such as B and T cells, to combat a particular pathogen. One theory is that young bodies have multiple potentially resistant immune systems. In adults, these B and T cells are adapted to resolve previously detected infections, but when confronted with a relatively new pathogen, such as SARS-CoV-2, remain little ones are available to detect new tricks. In some cases, adult bodies also recruit immune cells that are not good for work, an incorrectly calculated response that, at its worst, can lead to escape effects that are harmful to the body. while the virus is not cleared. Young people have a much more diverse set of “naive” immune cells, giving them a much better chance of producing antibodies that can predict novel infection. They learn lessons immediately, like a child listening to a new language.

Does Delta make children more ill than other races?

There is little evidence to date to suggest that Delta variation is more harmful to children than adults. According to the CDC, there is some evidence that Delta infections are more severe in all age groups, but the agency has not yet offered a specific breakdown for children. In Ontario, where Fisman tracks the hospitalization rate of young people, children under 10 infected with Delta are more than twice as likely to be hospitalized as those infected in other races. But the data is a bit far -fetched – in the province, there are 1,300 cases of children under 10, and only 26 have been hospitalized – and there are few cases to be estimated that are relatively at risk of admission or death in the ICU. But Fisman’s confidence in his conclusion rises as more data comes. “The stakes are a bit higher for keeping it away from kids,” he said.

An even bigger problem is how fast the Delta is moving before the population has changed, Fisman added. Say that coming in different ways means doubling the hospitalization rate for children with Covid-less than 1 percent of cases in children under 18 before Delta arrived, according to at the CDC. That’s another small number. But with a virus now moving to a more aggressive clip, the growing denominator-the overall number of cases-has become significant. “That means extraordinary events happen in a lot of numbers,” Fisman said. “That’s a big concern.”



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