Updated on May 8 at 11:54 a.m. ET
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 with symptoms including rash; conjunctivitis; redness in the lips, tongue and mucous membranes of the mouth and throat; swollen hands and/or feet; and sometimes an enlarged 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 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, including 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.
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.
Dr. Deepika Thacker, a cardiologist with Nemours Children's Health System, in Wilmington, Del., says she's seen three cases in children that fit the profile for the new syndrome. The first case was back in mid-April.
"When we first saw that kid, we didn't know what it was," she says. But a couple of days later, a pediatrician friend from the U.K. sent her a WhatsApp message about the emerging syndrome. "In retrospect, that's what it was," Thacker says now.
"He responded beautifully to treatment, so he was already out of the hospital by the time I got bad reports from Europe," she says. Since then, doctors have gone back to that first patient and tested the boy for antibodies to the coronavirus; they're still awaiting the results.
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. Dr. Purvi Parikh, a pediatric immunologist at NYU Langone Health, says she's seen three patients with the syndrome in the past week, all of whom are doing well with treatment.
"They all present in varying ways," says Parikh, who is also a spokesperson for Physicians for Patient Protection. "But the common theme was fever and rash. One had very, very swollen lymph nodes and lymph glands. And then, aside from that, they had markers of inflammation elevated in their blood."
"Up until now, we were mostly seeing these markers of inflammation in adults that were presenting with COVID-19," Parikh says. "But now we're also seeing a similar syndrome in children."
A spokesperson for Children's Healthcare of Atlanta says infectious disease specialists there are evaluating several cases of children who have exhibited Kawasaki-like symptoms and inflammation — to determine if those patients may also have had COVID-19 and to investigate if any association between the two conditions might exist.
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."
DAVID GREENE, HOST:
In recent weeks, doctors have been noticing something strange in children. They've reported dozens of cases of this unusual group of symptoms that they think might be related to COVID-19. We have NPR health correspondent Maria Godoy here to talk to us about what is being called Pediatric Multi-System Inflammatory Syndrome. Hi, Maria.
MARIA GODOY, BYLINE: Hi, David.
GREENE: OK. That's a jumble of words, but a jumble that sounds really serious, potentially. I mean, can you talk me through what doctors are seeing here in children?
GODOY: Well, you know, it is serious. But I want to emphasize that this is still really, really rare. So parents should not panic. The majority of kids who have gotten this and have gotten treatment, they are recovering. And they're doing well. As for the symptoms, they can vary.
But basically, doctors are seeing kids with a persistent high fever, really marked inflammation in the heart and some symptoms of shock, which means, you know, low blood pressure. Some kids are coming in with severe abdominal pains, vomiting, that kind of thing. And some of them, their hearts or organs aren't working properly. Basically, doctors say these kids seem to be having a hyper immune response.
GREENE: And to be clear, most of those who are experiencing this either have or have had COVID-19, is that right?
GODOY: Right. Or they've been exposed to someone with a disease. Doctors say symptoms can show up days to weeks after illness.
GREENE: OK. So to what extent do doctors seem to know that this might be related to the coronavirus?
GODOY: You know, they're still figuring that out. This is new. The first cases of this syndrome were flagged in Europe just a few weeks ago. And when doctors first saw these cases, they thought that these symptoms look like something you'd see with rare diseases, like Kawasaki Disease Shock Syndrome or toxic shock syndrome.
But those conditions, like Kawasaki, for instance, they're so rare that even seeing a handful of kids showing up with these symptoms in a short period of time, that was enough to set off alarm bells. And then, as it turns out, the majority of them have this common factor of testing positive for coronavirus or antibodies to it. And then there's the whole question of the timing of these cases.
GREENE: What's up with the timing? Why is that a question here?
GODOY: Well, you know, most of these reports are coming from places like New York and the U.K. a few weeks after they had a big surge in COVID-19 cases. And so that time suggests that a very small percentage of kids seem to be experiencing some kind of immune system over-response to the virus - at least, that's the theory.
GREENE: So New York, the U.K., are those generally the places where we're seeing this? Or it's been elsewhere also?
GODOY: There have been reports from Spain, Italy and France. In the U.S., doctors in Atlanta and in Wilmington, Del., tell me they're evaluating several suspected cases. New York state reported 64 suspected cases this week. But really, doctors are just starting to get a handle on this. And so they all emphasize the syndrome is really rare.
GREENE: And so what, then, is their message to parents at this early point?
GODOY: So most kids who get COVID-19 are having a mild course. In contrast, these kids are getting really sick. They might be listless. They're having high fever for several days. One doctor I spoke with suggested five to seven days. And they may have a rash, red eyes, abdominal pain, diarrhea, vomiting. They look really sick. So if you're a parent seeing those conditions, call the doctor.
GREENE: All right. NPR's health correspondent Maria Godoy. Maria, thanks a lot for this.
GODOY: Thank you. Transcript provided by NPR, Copyright NPR.