<h4>Objective</h4>To investigate the correlation between the neutrophil-to-apolipoprotein A1 ratio (NAR) and disease severity, long-term prognosis, and risk of relapse in patients with anti-N-methyl-D-aspartate receptor (anti-NMDAR) encephalitis.<h4>Methods</h4>This study included 125 patients with anti-NMDAR encephalitis as a retrospective cohort. Here, APOA1 is linked to viral encephalitis.