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Journal of Clinical Microbiology, April 1998, p. 975-978, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Detection of Mycobacterium tuberculosis
Complex in Sputum Specimens by the Automated Roche Cobas Amplicor
Mycobacterium Tuberculosis Test
Iiris
Rajalahti,1,*
Pauli
Vuorinen,2
Markku M.
Nieminen,1 and
Ari
Miettinen2
Departments of Pulmonary
Diseases1 and
Clinical
Microbiology,2 Tampere University Hospital,
FIN-33521, Tampere, Finland
Received 16 September 1997/Returned for modification 3 November
1997/Accepted 23 December 1997
Three hundred twenty-four sputum specimens from 151 patients with
suspected active pulmonary tuberculosis were tested for the presence of
the Mycobacterium tuberculosis complex with auramine fluorochrome stain and automated PCR assay (Roche Cobas Amplicor Mycobacterium Tuberculosis Test [MTB]). The results were compared with those of the conventional Löwenstein-Jensen tube culture and
the BACTEC radiometer liquid culture. A total of 76 specimens from 32 patients were culture positive for M. tuberculosis. In addition, 37 specimens from 15 patients were smear and culture positive
for other Mycobacterium species but negative by the present nucleic acid amplification method and thus were not included in the
comparison. Compared with culture, the sensitivities, specificities, and positive and negative predictive values for acid-fast smear were
67, 98, 93, and 91% and those for the Cobas Amplicor MTB were 83, 99, 97, and 95%, respectively. When three consecutive sputum specimens per
patient could be obtained, the sensitivity of the Cobas Amplicor MTB
improved to 91%, whereas the sensitivity of the acid-fast smear
remained unchanged.
*
Corresponding author. Mailing address: Department of
Pulmonary Diseases, Tampere University Hospital, Box 2000, FIN-33521, Tampere, Finland. Phone: 358-3-2473296. Fax: 358-3-2473006. E-mail: irajalahti{at}tays.fi.
Journal of Clinical Microbiology, April 1998, p. 975-978, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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