MOG and influenza: The underlying cause often eludes identification, although some patients have evidence of antecedent or concurrent infections (e.g., Epstein–Barr virus, mumps, varicella-zoster virus, herpes simplex virus, human herpesvirus 6, and influenza) or the presence of autoantibodies (e.g., to myelin oligodendrocyte glycoprotein (MOG)) at the time of diagnosis or death [1,2,3,4,5,6,7].