The median CRP concentration in CSF in the whole cohort was 0.00 (IQR 0.00–0.00), with 6.62 mg/L (IQR 3.37–14.4) in bacterial meningitis patients, and 0.00 mg/L (IQR 0.00–0.00) in all other patients (Fig. 1, Supplementary Fig. S2 and Table S2). This evidence concerns the gene CRP and bacterial meningitis.