“…Leukocyte lactate dehydrogenase activity (6,7) and lysozyme levels increase in bacterial, but not in viral meningitis (8)(9)(10). Other diagnostic markers of purulent meningitis include: decreased CSF cyclic adenosine 3',5'-monophosphate (11); increased lysozyme activity (10); increased creatinine phosphokinase (12); increased Creactive protein levels (13); and increased IgM concentration in the CSF (14). But none of these tests is specific for bacillary meningitis.…”