IL17A and myasthenia gravis: Furthermore, this study investigated the alterations of the level of Treg cells and cytokines (IL-4, IL-17A, TGF-β, IFN-γ) in peripheral blood and the gut microbiota in the intestinal tract of MG patients at baseline and after each phase so as to preliminarily explore how MBYD effects the immune system and gut microbiota in MG patients.