Vitamin D, <scp>HLA</scp>‐<scp>DRB</scp>1 and Epstein–Barr virus antibody levels in a prospective cohort of multiple sclerosis patients

Our study demonstrates monthly differences in EBNA-1 IgG levels and an association between EBNA-1 IgG, 25(OH)D levels and HLA-DRB1*15. These results indicate that EBNA-1 IgG serum levels are affected by genetic and environmental factors that also modulate multiple sclerosis risk.