I guess no. There are several antibodies used in treating autoimmune diseases. Retuximab is one of them and it targets B-Cells. Other target different cytokines like TNF-alpha and IL-2, slowing down the immune system and interupting inflamation. I guess the problem would be, that all the B-Cells would constantly produce more antibodies. It wouldn't help much. But if they identify an antibody, we would have a proper test and propably a good understanding of the underlying pathology of ME.