CXCL8 and Epstein-Barr virus infection: In the RRMS group, serum concentration of anti-EBNA IgG was inversely associated with the serum concentration of CXCL8 (ρ = −0.442, p = 0.009, Figure 3C), while this association was absent in the group of healthy control individuals (ρ = 0.202, p = 0.267), which might suggest the specific effects of EBV infection on immune cell trafficking and CXCL8 secretion in RRMS.