Abstract
A number of different biochemical and serological tests have been described recently for the early and accurate diagnosis of tuberculous meningitis. None of these tests has yet gained widespread acceptance in clinical medicine or in microbiology laboratories. To investigate this problem we evaluated adenosine deaminase activity (ADA), an enzyme linked immunosorbent assay (ELISA) that detects antibody to antigen 5 of Mycobacterium tuberculosis, and the radioactive bromide partition test (BPT) in the cerebrospinal fluid (CSF). Cerebrospinal fluid specimens from children with tuberculous, pyogenic, and viral meningitis as well as from patients with pulmonary tuberculosis without meningitis and from controls with normal CSFs were included inn the study. In addition, we estimated ADAs in serum samples from selected children in these groups. The sensitivity and specificity of the three tests evaluated in the CSF were: ADA assay 73% and 71%; BPT 92% and 92%; and ELISA for antibody to antigen 5, 53% and 90%, 40% and 94%, and 27% and 100%, respectively, at tires of more than or equal to 1:20, 1:40, and 1:80. The serum ADA was lower (11.0 +/- 6.15 IU/l) in children with tuberculous meningitis when compared with those with pulmonary tuberculosis alone (25.8 +/- 20.9 IU/l). The BPT was found to be the most reliable test in the early differentiation of tuberculous from other causes of meningitis and remained abnormal for a period of up to five months after the beginning of treatment. Accordingly, we believe that the BPT should be used in conjunction with bacterial and fungal antigen detection systems for the initial differentiation of clinically suspicious tuberculous meningitis from Gram or culture negative cases, or both, of bacterial and fungal meningitis.
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