What is myelin oligodendrocyte glycoprotein antibody-associated disease? Myelin oligodendrocyte glycoprotein antibody-associated disease, or MOGAD, is a rare autoimmune disease where the immune system attacks the protective myelin coating of nerves in the brain, spinal cord, and optic nerves, causing a wide range of neurological symptoms. Find our full video library only on Osmosis: http://osms.i