Europe and the United States have seen sharp surges in recent weeks of a severe immune disorder in children linked to Covid-19, health authorities reported Friday, sounding an alarm.

At least five children — three in New York, and one each in France and Britain — have died from the syndrome, and at least two other deaths are suspect.

Up to now, Covid-19 — with 4.5 million confirmed cases worldwide, and more than 300,000 deaths — has largely spared small children and teens, though many are thought to have been infected without showing symptoms.

But the new illness, while still very rare by comparison, suggests that no age bracket is safe.

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