PTX3 and viral meningitis: Levels of CSF PTX3 concentrations among patients with culture-confirmed bacterial meningitis (1010, IQR 168–2560) were significantly higher than among patients with viral meningitis (8, IQR 2–18, p<0.0001), viral encephalitis (4, IQR 2–25, p<0.02), Lyme neuroborreliosis (7, IQR 2–14, p<0.0001), and controls (1, IQR 1–1, p<0.0001).