GFAP and Autoimmunity: We searched the PubMed database with the key words of “GFAP astrocytopathy”, “GFAP autoimmunity”, “GFAP autoantibody”, “intracranial infection”, “meningitis”, “misdiagnose”, and within the literature from Jan 1, 2015 to Mar 15, 2024, 40 cases with A-GFAP-A with positive GFAP-IgG in CSF who were previously misdiagnosed with intracranial infection were reported.