No doubt, the distinguishing between bacterial and aseptic meningitis in the emergency department could help to limit unnecessary antibiotic use and hospital admissions. This study evaluated the role of cerebrospinal fluid IL-8 in differentiating acute bacterial meningitis (ABM) from aseptic meningitis (AM). A total of 80 hospitalized patients with clinical presentations of suspected acute meningitis were subjected to estimation of IL-8 CSF concentrations. The results showed that CSF IL-8 levels were higher in acute bacterial meningitis than in aseptic ones (p <0.05). The best cut-off value of CSF IL8 for early diagnosis of bacterial meningitis was 3.6ng/ml with a sensitivity of 82.5% and a specificity of
85.0%.