CD40LG and myeloid sarcoma: We found anti-Methanobrevibacter IgM, IgG and IgA antibodies (titre >1:64) as measured by enzyme-linked immunosorbent assay (ELISA) against lysates of Methanobrevibacter in 33% of MS patients and 28% of controls, with no differences in anti-Methanobrevibacter antibody titres between the two groups.