The serious inflammatory syndrome sending some children and teens to the hospital remains extremely uncommon, doctors say. But if your child spikes a high, persistent fever, and has severe abdominal pain and vomiting that doesn't make them feel better, call your doctor as a precaution.; Credit: Sally Anscombe/Getty Images

Sixty-four children and teens in New York State are suspected of having a mysterious inflammatory syndrome that is believed to be linked to COVID-19, the New York Department of Health said in an alert issued Wednesday. A growing number of similar cases — including at least one death — have been reported in other parts of the U.S. and Europe, though the phenomenon is still not well-understood.

Pediatricians say parents should not panic; the condition remains extremely rare. But researchers also are taking a close look at this emerging syndrome, and say parents should be on the lookout for symptoms in their kids that might warrant a quick call to the doctor — a persistent high fever over several days and significant abdominal pains with repeated vomiting, after which the child does not feel better.

"If [the child is] looking particularly ill, you should definitely call the doctor," says Dr. Sean O'Leary, a pediatric infectious disease specialist at Children's Hospital Colorado Anschutz Medical Campus and member of the infectious disease committee for the American Academy of Pediatrics.

The new condition associated with COVID-19 is called Pediatric Multi-System Inflammatory Syndrome. Symptoms include persistent fever, extreme inflammation, and evidence of one or more organs that are not functioning properly, says cardiologist Jane Newburger, a professor of pediatrics at Harvard Medical School and director of the Kawasaki Program at Boston Children's Hospital.

"It's still very rare, but there's been a wave of cases. Physicians and scientists are working hard to understanding the mechanisms at play, and why only some children are so severely affected," Newburger says.

Some symptoms can resemble features of Kawasaki Disease Shock Syndrome. Kawasaki Disease is an acute illness in children involving fever, together with symptoms of rash, conjunctivitis, redness in the lips, tongue and mucous membranes of the mouth and throat, swollen hands and/or feet, and sometimes a large group of lymph nodes on one side of the neck, says Newburger. Some children with the condition develop enlargement of the coronary arteries and aneurysms in those blood vessels.

A small percentage of Kawasaki cases go on to develop symptoms of shock – which can include a steep drop in systolic blood pressure and difficulty with sufficient blood supply to the body's organs. Kawasaki disease and KDSS more often affect young children, although they can sometimes affect teens, Newburger says.

Some cases of the new inflammatory syndrome have features that overlap with KD or with KDSS — including rash, conjunctivitis, and swollen hands or feet. The new inflammatory syndrome can affect not only young children but also older children and teens.

But patients with the new syndrome have lab results that look very different, in particular, "cardiac inflammation to a greater degree than we typically see in Kawasaki shock syndrome," which is usually very rare, O'Leary says. In New York City and London, which have seen large numbers of cases of COVID-19 cases, "those types of patients are being seen with greater frequency."

Some patients "come in very, very sick," with low blood pressure and high fever, O'Leary says. Some children have had coronary artery aneurysms, though most have not, he adds.

Other patients exhibit symptoms more similar to toxic shock syndrome, with abdominal pain, vomiting and diarrhea and high levels of inflammation in the body, as well as the heart, O'Leary says. Most cases are treated in the intensive care unit, he says. Treatment includes intravenous immunoglobulin, which can "calm the immune system," says Newburger, as well as steroids and cytokine blockers.

The evidence so far from Europe, where reports of the syndrome first emerged, suggests most children will recover with proper supportive care, says O'Leary, though one adolescent, a 14-year-old boy in London, has died, according to a report published Wednesday in The Lancet.

Most children with the syndrome, O'Leary and Newburger note, have either tested positive for a current infection with the coronavirus, or for antibodies to the virus, which would suggest they were infected earlier and recovered from it.

And, according to case reports, some of the kids with the inflammatory syndrome who tested negative on coronavirus tests had been exposed at some point to someone known to have COVID-19. The inflammatory syndrome can appear days to weeks after COVID-19 illness, doctors say, suggesting the syndrome arises out of the immune system's response to the virus.

"One theory is that as one begins to make antibodies to SARS-COV-2, the antibody itself may be provoking an immune response," says Newburger. "This is only happening in susceptible individuals whose immune systems are built in a particular way. It doesn't happen in everybody. It's still a really uncommon event in children."

In late April, the U.K.'s National Health Service issued an alert to pediatricians about the syndrome. Reports have also surfaced in France, Spain and Italy, and probably number in the dozens globally, Newburger and O'Leary say, though doctors still don't have hard numbers. Newburger says there needs to be a registry where doctors can report cases "so we can begin to generate some statistics."

"Doctors across countries are talking to each other, but we need for there to be some structure and some science so that everybody can interpret," she says.

Earlier this week, the New York City Health Department issued an alert saying 15 children ranging in age from 2 to 15 had been hospitalized with the syndrome. Newburger says that she's been contacted about cases in New Jersey and Philadelphia, as well.

While the syndrome's precise connection to the coronavirus isn't yet clear, O'Leary says the fact that the children in most of these cases are testing positive for exposure to the virus, one way or another, provides one point of evidence. The sheer number of cases — small in absolute terms, but still "much higher than we would expect normally for things like severe Kawasaki or toxic shock syndrome" — provides another, he says.

And then there's the fact that most reports of the syndrome have come out of the U.K. and New York City, places that have been hit with large numbers of COVID-19 cases.

"It's pure speculation at this point," he says, "but the U.K. cluster kind of went up about a month after their COVID-19 infections went up, which would suggest that it is some kind of an immune phenomenon."

This content is from Southern California Public Radio. View the original story at SCPR.org.

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