CD40LG and peripheral neuropathy: Peripheral neuropathy, demyelination, paraneoplastic tumor, autoimmune brain-related antibodies, serum antibodies IgM and IgG of C. jejuni were positive by enzyme-linked immunosorbent assay (ELISA), performed by Dr. Hao from the first hospital of Peking University (2), The values of IgM and IgG were greater than the negative control values (the cut-off values were 0.08 and 0.16 respectively) even after 1:160 dilution.