This Could Be What Keeps Kids from Developing Serious Coronavirus Symptoms

Young, healthy blood vessels may be helping kids stay safe from COVID-19.

Nearly eight million people globally have been infected with coronavirus, with the illness claiming more than 434,700 lives in total. However, COVID-19 isn't an equal-opportunity ailment—the virus disproportionately affects people in the high risk category, which includes anyone over the age of 65, according to the Centers for Disease Control and Prevention (CDC). There's one group of people that seem to largely be spared from COVID-19's more severe effects, however: children—and experts believe it may be their young blood vessels preventing kids from getting getting seriously ill.

According to the CDC, at the virus' peak on April 18th, people above the age of 55 accounted for more than 15,000 coronavirus deaths, while those under the age of 24 accounted for fewer than 20. Paul Monagle, MD, a pediatric hematologist at the Royal Children's Hospital in Melbourne, Australia, told Newsweek that he believes the "likely explanation" for the difference in COVID-19 mortality rates between young and old people relates to specific differences in their blood vessels.

Grandmother and granddauther touch hands on window while on visit. Senior woman staying at home in time of quarantine for coronavirus or Covid-19. Lockdown visit of a senior adult.

Blood clots have emerged as one of the more serious complications related to coronavirus; in a 2020 study published in the journal Thrombosis Research, among 184 severe coronavirus cases in the Netherlands, 31 percent had some type of blood clotting issue. A study published in The New England Journal of Medicine on May 21 found that these blood clotting issues in coronavirus cases may be caused by injury to a person's endothelium, the layer of cells that coat blood vessels and provide a barrier between blood and tissue.

"One of the great mysteries of COVID-19 has been why blood clots, or thrombosis, form in some patients who are infected," William Li, MD, president and medical director of the Angiogenesis Foundation and co-author of the New England Journal of Medicine study said in statement. Li explained that when these blood clots form, they can severely restrict blood flow in the brain, heart, lungs, and other areas of the body, potentially leading to death. "Our research is the first to show that these clots are associated with damaged blood vessels," said Li.

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While a 1994 study published in the Journal of the American College of Cardiology suggests that damage to the endothelium is part of the normal aging process in most adults, Monagle believes that developing endothelia in children are what's preventing kids from developing severe cases of coronavirus, as it protects their blood vessels, keeping them healthier and less likely to incur damage that might cause clots.

Monagle's team will be testing this theory by researching how coronavirus affects blood clot formation in experiments using plasma and blood from children, adults, and elderly people. "We will then test multiple potential drugs that could ameliorate the clotting effect, to determine the likely best candidates to take to a clinical trial," Monagle told Newsweek. "I think it is possible this work will help with treatments and also may help to predict which patients are at highest risk." And if your kid is feeling under the weather, make sure you know these 7 Signs Your Child Could Have Coronavirus.

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