More than two million people worldwide were affected by multiple sclerosis (MS) in 2015, with rates varying widely among different populations. This book explores the basics of MS, which is the most common immune-mediated disorder affecting the central nervous system.Multiple sclerosis is a demyelinating disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged. This damage disrupts the ability of parts of the nervous system to communicate, resu...