Researchers have mapped the immune response in children affected by a rare but life-threatening inflammatory syndrome associated with COVID-19. The study, which is published in the scientific journal Cell, reveals that the inflammatory response differs from that in Kawasaki disease and severe acute COVID-19.

In the current SARS-CoV-2 pandemic, with very few exceptions, children have presented with mild symptoms. However, paediatricians have discovered a new, life-threatening hyperinflammatory syndrome resembling Kawasaki disease and named Multisystem Inflammatory Syndrome in Children associated with COVID-19, MIS-C.

In a new collaborative study, researchers have worked out the immunological aspects of this rare condition. They compared blood samples from 13 MIS-C-patients treated at Karolinska University Hospital in Stockholm, Sweden and Bambino Gesù Children's Hospital in Rome, Italy, with samples from 28 Kawasaki disease patients collected from 2017 to 2018, prior to COVID-19. The analyses also included samples from children with mild COVID-19.

"Our results show that MIS-C is truly a distinct inflammatory condition from Kawasaki disease, despite having some shared features," says one lead author of the study. "The hyperinflammation and cytokine storm detected in children with MIS-C is also different from that seen in adult patients with severe, acute COVID-19, which we recently described in another publication."

When comparing MIS-C to these other inflammatory states, the study observed differential frequency of specific immune cell populations, inflammatory cytokines and chemokines in the blood. Unlike children with Kawasaki disease and children with mild COVID-19, children who developed MIS-C were lacking IgG-antibodies to common cold coronaviruses. The researchers also found several autoantibodies that target the body's own proteins and that may contribute to the pathogenesis of MIS-C. They are now also looking into genetic risk factors for developing MIS-C after SARS-CoV-2 infection.

"There is an urgent need to better understand why a small minority of children infected with SARS-CoV-2 develop MIS-C, and we are adding a piece to the puzzle," says the author. "Better knowledge of the pathogenesis is important for development of optimal treatments that can dampen the cytokine storm and hopefully save lives, as well as for vaccine development to avoid MIS-C caused by vaccination."

https://news.ki.se/rare-hyperinflammatory-syndrome-in-children-with-covid-19-described

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