In this non-autoimmune group, plasmacytosis was rarely detected (Figure 1B, lower panel), and mean plasma cell counts 7 days after admission (1.8 ± 17 cells/μl, n = 96) were significantly less elevated than in IVIg-treated patients (GBS: 283 ± 343 cells/μl, n = 30, p<0.0001, CIDP: 107 ± 31 cells/μl, n = 6, p<0.0001, MG: 223 ± 272 cells/μl, n = 21, p<0.0001, data not shown). Here, PMP22 is linked to Guillain-Barre syndrome.