LCN2 and viral encephalitis: Subsequently, the result suggested LCN2 concentration of ≥59 ng/mL could accurately distinguish BM from TBM, encephalitis and non-CNS infections groups, with an AUROC value of 0.97 (95% CI, 0.92–1), corresponding to a sensitivity of 1 (95% CI, 0.72–1) and a specificity of 0.86 (95% CI, 0.71–0.94) (Fig. 2(B) and (C)).