Several other studies have previously studied CRP in CSF as a potential biomarker for bacterial meningitis, but sample sizes were often small and most studies compared culture-positive bacterial meningitis to either viral meningitis or controls with normal CSF parameters, and excluded patients with other diagnoses.18, 19, 20, 21 Clinical implementation of CRP measurement in CSF has, so far, not been described. Here, CRP is linked to viral meningitis.