High Free IgE and Mast Cell Activation in Long COVID: Mechanisms of Persistent Immune Dysregulation. - Genova, Sylvia; Pencheva, Mina; Burnusuzov, Hasan; Bozhkova, Martina; Kulinski, Georgi; Kostyaneva, Stefka; Tilkiyan, Eduard; Abadjieva, Tsvetana (Life (2075-1729), 2025)