Of those with anti-MOG results classified as FP, 13 were low-positive (more likely alternative diagnoses identified: MS, 7; spinal cord infarction, 1; idiopathic bilateral facial palsy, 1; post-HSV anti-NMDAR encephalitis, 1; neurodevelopmental disorder with epilepsy secondary to perinatal brain injury, 1; ocular manifestations of inflammatory bowel disease, 1; systemic lupus erythematosus without neuropsychiatric involvement, 1) and 2 were clear-positive (more likely alternative diagnoses identified: neurosarcoidosis, 1; autoimmune encephalitis, 1). This evidence concerns the gene MOG and autoimmune encephalitis.