The first case reported outside Japan was in Hawaii in 1976. It's called multisystem inflammatory syndrome, although some people have been referring to it as Kawasaki-like disease.
Numerous children in England who were diagnosed with MIS-C are from ethnic minoritie, Levin said.
They may "have an abnormal and aggressive immune response to Covid - and that immune response is so aggressive that it affects other organ function and affects their ability to maintain their blood pressure", Ofori-Amanfo said.
The doctors cautioned that it is too early to conclude that the new syndrome is, in fact, Kawasaki disease.
He acknowledged there was still much officials do not know about MIS-C, but said that most cases have shown up about four weeks after COVID-19. However, coronavirus is. That's why it's important for kids to practice the guidelines laid out by the CDC to stop the spread of COVID-19.
A very small number of children have had a serious illness that is linked to the Covid-19 outbreak. One patient is in its pediatric intensive care unit.
The CDC says it is not now known if MIS-C is specific to children or if it also occurs in adults, but it recommends that providers who have cared for patients under age 21 who meet MIS-C criteria to report suspected cases to their local or state health departments.
How widespread, geographically, is this syndrome?
Then doctors in NY state began reporting cases, too, more than 100 to date, and many of them hospitalized in intensive care units.
Parents should watch for persistent fever in their children and contact their pediatrician if a child appears especially ill.
Though Madhavan said PMIS cases are increasing in "multiple countries", she emphasized that the number "remains low compared to the overall number of COVID-19 infections, and the incidence of very severe complications remains even lower".
"Any child at home who has fever, abdominal pain or symptoms such as rash and conjunctivitis should be seen by a pediatrician right away", said Dr. James Schneider, who heads pediatric critical care at Northwell Health in NY.
"Any child at home who has fever, abdominal pain or symptoms such as rash and conjunctivitis should be seen by a pediatrician right away", he advised.
"We are using treatments known to be effective for Kawasaki disease - IVIG, aspirin, steroids", he said.
"What we've asked for is for the global network of clinicians to be on alert for this and to ensure that they capture information on children systematically so that we can better understand what is occurring in children and so that we can better improve our understanding and guide treatment.""They need good, old-fashioned critical care".
What do the experts say?
Because the children were previously healthy, he thinks the abnormalities were caused by MIS-C, possibly as a result of a delayed immune response to the coronavirus.