Keywords: ALT, Alanine transaminase; AST, aspartate aminotransferase; COVID-19; CRP, C-reactive protein; DIF, direct immunofluorescence; ED, Emergency Department; ESR, Erythrocyte sedimentation rate; ESRD, end-stage renal disease; EULAR/PRINTO/PRES, European League Against Rheumatism/Paediatric Rheumatology International Trials Organisation/Paediatric Rheumatology European Society; H&E, Hematoxylin and eosin; HSP, Henoch-Schönlein purpura; Henoch-Schönlein purpura; IgA vasculitis; IgA, Immunoglobulin A; PCR, polymerase chain reaction; vasculitis.