Mechanisms through which these bacteria contribute to MS may include, weakening of immune system and induction of autoimmune myelin sheath deterioration, production of GABA degrading enzyme GABAT, GABA fermentation and initiating inflammation by inhibiting anti-inflammatory IL10 expressing human CD4+CD25+T cells (Cekanaviciute et al., 2017, Ochoa-Repáraz et al., 2018, Shahi et al., 2017, Strandwitz et al., 2019). This evidence concerns the gene ABAT and myeloid sarcoma.