Although autoimmune dementia has not, encephalitis has been reported in conjunction with LGI1 antibodies, and it is conceivable that similar phenomena are related to LGI1 antibodies associated with autoimmune dementia, such as the LGI1 autoantibodies that drive the pathogenesis that might culminate in an autoimmune dementia phenotype. This evidence concerns the gene LGI1 and viral encephalitis.