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Year : 2010  |  Volume : 28  |  Issue : 4  |  Page : 366-369

Evaluation of BioFM liquid medium for culture of cerebrospinal fluid in tuberculous meningitis to identify Mycobacterium tuberculosis


1 Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur - 440 010, India
2 Environmental Genomics Unit, National Environmental Engineering Research Institute, Nehru Marg, Nagpur - 440 020, India

Correspondence Address:
H Daginawala
Biochemistry Research Laboratory, Central India Institute of Medical Sciences, Nagpur - 440 010
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0255-0857.71820

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The present study was designed to evaluate the sensitivity and specificity of liquid culture medium (BioFM broth) for the diagnosis of tuberculous meningitis (TBM) in cerebrospinal fluid (CSF). CSF samples from 200 patients (TBM group = 150 and non-TBM group = 50) were tested for culture of Mycobacterium tuberculosis in BioFM liquid culture medium. Out of 150 TBM cases, 120 were found to be culture positive, indicating a sensitivity of 80% in BioFM broth within 2-3 weeks of inoculation. Positive cultures were also observed for CSF from 32 (64%) out of 50 non-TBM patients in BioFM liquid culture medium within 4 days of sample inoculation. Therefore, according to our study, BioFM broth system yielded 80% sensitivity [95% confidence interval (CI): 67-93%] and 36% specificity (95% CI: 57-98%) for TBM diagnosis. Our results indicate that although BioFM broth allows the detection of positive cultures within a shorter time, it has a high potential for contamination or for the coexistence of M. tuberculosis and non-tuberculous meningitis (NTM). This coexistence may go undetected or potentially lead to erroneous reporting of results.






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