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Distribution of virus-specific CSF antibody indices (AI) of (a) childhood onset and (b) adult onset MS patients with intrathecal antibody synthesis (AI ≥ 1.5) against measles, rubella, varicella zoster (VZV), herpes simplex (HSV) or Epstein-Barr virus (EBNA-I and EBV-VCA). Horizontal bars mark median AI values. Median AI for EBNA-I and EBV-VCA were lower than for the other neurotropic viruses
