Canadian doctors are seeing new cases of a rare inflammatory illness in kids believed to possibly be linked to COVID-19.

Clusters of what is called multisystem inflammatory syndrome in children (MIS-C), or pediatric inflammatory multisystem syndrome (PIMS), have been reported at Toronto’s Hospital for Sick Children as well as CHU Sainte-Justine hospital in Montreal.

Symptoms of the condition are similar to Kawasaki disease, a rare blood vessel disorder that causes rashes and a prolonged fever.

The case definition for this syndrome continues to evolve, said a spokesperson for the Hospital for Sick Children, but the hospital has seen approximately 20 patients over the past three weeks with “unexplained fevers for three or more days and whose blood tests show high inflammatory markers.”

READ MORE: Teen says inflammatory disorder linked to coronavirus feels like being ‘internally on fire’

“The relationship between these patients and COVID-19 is still unclear as all have tested negative for COVID-19 with a nasopharyngeal swab and very few had any confirmed contact with COVID-19 cases,” the spokesperson said.

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“The children we have seen have all responded well to our current therapies for severe inflammation.”