Two new studies involving a total of 75 children published yesterday in JAMA showed that the pediatric multisystem inflammatory syndrome linked to COVID-19 is novel and different from Kawasaki disease (KD) and toxic shock syndrome (TSS). One study involved 58 children admitted to eight hospitals in the United Kingdom with COVID-19 who met the criteria for pediatric inflammatory multisystem syndrome temporally associated with severe acute respiratory syndrome coronavirus 2 (PIMS-TS) from Mar 23 to May 16. The other study described 17 children and adolescents admitted to a single hospital in New York City with COVID-19 who developed PIMS-TS with features overlapping with but different from those of KD from Apr 18 to May 5. Reports of the rare but serious illness began surfacing around the world in the months after the pandemic began.


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Woman with sick baby calling doctor. Worried mom looking at thermometer showing high temperature of her little child and calling doctor for advice.

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