Pathogenicity of B and CD4 T Cell Subsets in Multiple Sclerosis

This study is researching how certain immune cells in the blood and spinal fluid contribute to multiple sclerosis (MS), a disease where the immune system mistakenly attacks the brain and spinal cord. Researchers want to better understand why the disease progresses and find new ways to treat it. **You may be eligible if...** - You are 18 or older - You have been diagnosed with multiple sclerosis (using the 2010 McDonald criteria) or have had a first episode that may be MS - You are already scheduled for a blood draw or spinal fluid test for diagnosis or treatment purposes - You have health insurance coverage - You are willing to participate **You may NOT be eligible if...** - You are pregnant or breastfeeding - You are a minor, deprived of liberty by court order, or legally unable to give consent Talk to your doctor to see if this trial is right for you.