Results: The median ADA level were 1.695 (CI 95% 1.2 - 2.2), 6.88 (CI 95% 4.79 - 8.95), and 8.14 (CI 95% 5.08 - 11.2) in viral meningoencephalitis group (lowest), tuberculous meningitis group and bacterial meningitis group (highest), respectively.