PRB2 and Guillain-Barre syndrome: However, in subjects with recent/exposed infections by C. jejuni anti-GM1 IgG and the heteromeric complexes GM:PS, GM1:GT1a, GM1:GD3, GM1:Sulfatide, and GD1a:GT1a were associated with GBS in the conditional logistic regression models adjusted for sex, upper respiratory infection or influenza four weeks before onset or the number of infections (S7 Table).