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Journal of Clinical Microbiology, August 1998, p. 2191-2194, Vol. 36, No. 8
Department of Infectious Diseases,
Received 13 November 1997/Returned for modification 8 February
1998/Accepted 12 May 1998
Eighty-four cerebrospinal fluid (CSF) samples from different
children who presented with signs and symptoms of meningitis were
evaluated for the presence of Mycobacterium tuberculosis complex organisms by the Gen-Probe Amplified
Mycobacterium tuberculosis Direct Test (MTD; Gen-Probe, San
Diego, Calif.). All CSF samples had negative acid-fast smears by the
Ziehl-Neelsen staining method. M. tuberculosis was
recovered from five samples. M. tuberculosis did not grow
from 19 additional samples, but the samples were from patients who
fulfilled specific clinical and laboratory criteria for probable
tuberculous meningitis (TBM). The remaining samples (n = 60) were from patients with other
infections or noninfectious causes of meningitis. The results of the
MTD were interpreted as positive or negative on the basis of
recommended cutoff values for respiratory specimens. These results were
interpreted as true or false positives or true or false negatives on
the basis of the results of M. tuberculosis culture or
whether the patient fulfilled criteria for probable TBM. The Gen-Probe
MTD was 33% sensitive and 100% specific for detecting M. tuberculosis complex organisms in these 84 CSF samples. If the
cutoff values for positive results were decreased for the MTD (
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Clinical Evaluation of the Gen-Probe Amplified
Direct Test for Detection of Mycobacterium tuberculosis
Complex Organisms in Cerebrospinal Fluid
11,000
versus
30,000 relative light units), the sensitivity increased to
83% and the specificity remained 100%. These results for the MTD are
encouraging considering that TBM is a highly fatal disease and
difficult to diagnose by conventional laboratory techniques.
*
Corresponding author. Mailing address: Division of
Clinical Microbiology, Mayo Clinic, Hilton 4, 200 First St. S.W.,
Rochester, MN 55905. Phone: (507) 284-2901. Fax: (507) 284-4272. E-mail: cockerill.franklin{at}mayo.edu.
Journal of Clinical Microbiology, August 1998, p. 2191-2194, Vol. 36, No. 8
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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