CXCR1 and COVID-19: We measured the plasma levels of CC and CXC chemokines (Fig. 2) and observed that the levels of CCL2 CCL5, CCL11, CCL19, CCL20 and CXCL10 were significantly higher in PIMS-TS compared to COVID-19, seropositive and control children; COVID-19 children had elevated levels of CCL2, CCL5, CCL11 and CXCL10 in comparison to seropositive and/or control children; and seropositive children had elevated levels of CCL5 and CXCL10 in comparison to control children.