That stood out to me as well. I think it meant to say: 2% of children who were diagnosed with the multisystem inflammatory syndrome (MIS-C) died from it.

> 80% of the children who developed the condition required intensive care, 20% required mechanical ventilation, and four children, or 2%, died. [https://www.statnews.com/2020/06/29/nejm-inflammation-childr...]