Dysregulated serum levels of autoantibodies against the amyloid β peptide (IgA and IgG), NMDA receptor (IgA and IgG), GAD-65 (IgG), S-100B (IgG), BDNF (IgG), D1 receptor (IgG), tau protein (IgG), acetylcholine receptor (IgA), α-synucleins (IgA), myelin basic protein (IgA), etc. were detected in patients with COVID-19 compared with healthy controls (Table 1). The gene discussed is GAD2; the disease is COVID-19.