GFAP and autoimmune encephalitis: The patient tested negative for anti-myelin oligodendrocyte glycoprotein (MOG) antibodies, glial fibrillary acidic protein (GFAP), as well as other autoimmune encephalitis antibodies (anti-GABAB, anti-AMPAR1, anti-AMPAR2, anti-LGI1 and anti-CASPR2).