LBP and COVID-19–associated multisystem inflammatory syndrome in children: When the loss of intercellular tight junctions and elevated zonulin levels result in increased intestinal mucosal permeability, or when elevated levels of LPS-binding protein (LBP) and soluble CD14 in children with multisystemic inflammatory syndrome (MIS-C) signify loss of gastrointestinal mucosal integrity, the severe acute respiratory syndrome coronavirus 2 (SARS CoV-2) viral antigen can pass through the mucosal barrier and enter the bloodstream, causing antigenemia and other symptoms (9).