CRP and viral meningitis: A meta-analysis published in 2015 by Vikse et al. included nine studies with a total of 725 patients and concluded that serum procalcitonin had a pooled sensitivity of 0.90 (95% CI 0.84–0.94), a specificity of 0.98 (0.97–0.99), a positive likelihood ratio of 27.3 (8.2–91.1), a negative likelihood ratio of 0.13 (0.07–0.26), a diagnostic odds ratio of 287.0 (58.5–1409.0), and, thus, is far superior to CRP for rapid differentiation between bacterial and viral meningitis [26].