Clinical score. Infection with wild-type Staphylococcus aureus (ATCC 29213) on day 4 postimmunization (pi) prevented disease onset in myelin oligodendrocyte glycoprotein induced experimental autoimmune encephalomyelitis (MOG-EAE). Data represented as means ± S.E.M. of the daily score. The clinical score represents spinal cord lesions. Presence of optic neuritis is not included (n = 16, infected; n = 14, noninfected).