He said that World Health Organization has made a preliminary case definition for the disease as a "Multisystem Inflammatory Syndrome in Children".
Medics at a hospital that treated the first child to die in France with a puzzling inflammatory condition seemingly linked to the new coronavirus initially thought the 9-year-old had scarlet fever, and sent him home.
Health care providers, including hospitals, are required to report to the Department of Health all cases of pediatric multisystem inflammatory syndrome potentially associated with COVID-19 in those under 21 years of age.
In New York, Governor Andrew Cuomo said on Tuesday that three children in the state had died and more than 100 cases were being investigated.
NY on Sunday said it was investigating up to 85 cases of children with the syndrome.
The Floating Hospital for Children at Tufts Medical Center also has seen patients with symptoms consistent with PMIS, a spokesman said Thursday, but their diagnoses have not yet been confirmed or reported to DPH.
According to CNN, the disease most often presents in children aged between 5 and 14.
The disease has puzzled health authorities of several countries for the past two weeks even though the children are not very affected by the severe forms of Covid-19. Some children tested positive for COVID-19, others have not.
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Dr Siobhan Ni Bhriain, HSE Integrated Care Lead, said it's typically small children who are affected by PIMS syndrome and those affected would usually be "very, very sick". We put out a note two days ago, which requests doctors to provide information in a standardised format so that we can quickly learn as much as possible about the syndrome. In the previous five years, the hospital treated a total of 19 Kawasaki-like patients.
The illness poses a new risk to children, which appear less likely to be severely infected by the coronavirus itself, but are believed to help its spread. About 125 children in France have developed Kawasaki-like symptoms during the coronavirus outbreak, arousing suspicions of a link.
It is the first death of its kind in France following similar child fatalities that are being investigated in London and NY.
"The Covid-19 epidemic is still active in France so we must remain cautious", the health ministry said. In England, six of the first eight cases observed were in children of Afro-Caribbean origin, according to a study last week in The Lancet.
Children's Hospital urged parents to watch out for those symptoms in their children, and to talk to their pediatrician if they have any concerns.
Some doctors have suggested that the antibodies to the coronavirus are triggering an immune reaction in the body, but at this point, nothing has been proven.