CD4 and Guillain-Barre syndrome: Here we found that both, exclusive GBS pre-stimulation of monocytes (median 19.5% (with GBS) versus 36.0% (without GBS) for CD4+- and 20.5% (with GBS) versus 52.5% (without GBS) for CD8+-T cell proliferation, Fig. 2a, b) and exclusive GBS pre-stimulation of T cells (median 31.5% (with GBS) versus 47.5% (without GBS) for CD4+- and 50.% (with GBS) versus 61.0% (without GBS) for CD8+-T cell proliferation, all n = 6, p < 0.05, Fig. 2c, d), led to a decreased CD4+- and CD8+-T cell proliferation; however, the effect after GBS pre-stimulation of monocytes was stronger.