Abstract During the winter months of 2020/2021 a wave of multisystem inflammatory syndrome in children (MIS-C) emerged in Poland. We present the results of a nationwide register aiming to capture and characterise MIS-C with a focus on severity determinants. The first MIS-C wave in Poland was notably high. hence our analysis involved 274 children. https://fitnessgravesyardes.shop/product-category/crank-arm/