But unlike COVID-19, these symptoms may take many weeks to show up in kids. When the CDC first warned about this syndrome, my colleague Sarah Zhang wrote a fascinating article explaining why the delay in identifying MIS-C was so dramatic. COVID-19 and MIS-C both can involve a serious immune-system dysfunction known as a cytokine storm. The process seems to be triggered by the coronavirus in both ailments, but it happens on different time scales. When adults come down with a severe case of COVID-19, their immune system goes into overdrive and crashes within days or weeks of contracting the coronavirus. Because this same crash rarely happens in kids, it initially seemed like they were mostly not harmed by the virus. But it seems now that some immune effects just take longer to show themselves.
https://www.theatlantic.com/health/archive/2020/07/paging-dr-hamblin-kids-coronavirus-inflammatory-syndrome/613714/?utm_term=2020-07-01T16%3A26%3A25&utm_content=edit-promo&utm_medium=social&utm_source=facebook&utm_campaign=the-atlantic