GFAP and Lyme disease: Among the 135 patients tested positive for CSF GFAP-IgG in the database between May 2017 and February 2023, 52 had a clinical diagnosis after February 2021, 3 had a final diagnosis that was not GFAP astrocytopathy (central nervous system tumor, tuberculous meningitis, and radiculo-myelitis secondary to Lyme disease), and 6 were excluded for missing clinical data.