ACT128800 Inclusion Exclusion

Drug: ACT-128800

Drug: Placebo

Ages Eligible for Study:        18 Years to 55 Years   

               
Genders Eligible for Study:     Both 

Accepts Healthy Volunteers:     No     

Inclusion Criteria:

1. Adult males and females               
2. Diagnosis of RRMS as defined by the revised (2005) McDonald Diagnostic Criteria for Multiple Sclerosis (MS).  
3. Signed inform consent prior to initiation of any study-mandated procedure.

  Exclusion Criteria:

1. A diagnosis of MS categorized as primary progressive or secondary progressive or progressive relapsing.
2. Patients currently treated for an autoimmune disorder other than MS.
3. Contraindications for MRI.  
4. Ongoing bacterial, viral, or fungal infection.
5. History or presence of malignancy.