Rare reports discuss Myelin Oligodendrocyte Glycoprotein (MOG) Antibody-associated Disease (MOGAD) (acute disseminated encephalomyelitis) after vaccination, and there exist some hypotheses about the postexposure synthesis of pathogenic IgG, as well as vaccine-induced bystander inflammation-induced tissue injury and antigen presentation (mimicry theory) or the emergence of a potential pre-existing autoimmune illness [161]. Here, OMG is linked to acute disseminated encephalomyelitis.