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Journal of Clinical Microbiology, April 1999, p. 964-970, Vol. 37, No. 4
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification of Mycobacterium kansasii
by Using a DNA Probe (AccuProbe) and Molecular Techniques
Elvira
Richter,1,*
Stefan
Niemann,1
Sabine
Rüsch-Gerdes,1 and
Sven
Hoffner2
Forschungszentrum Borstel, National Reference
Center for Mycobacteria, Borstel, Germany,1
and Swedish Institute for Infectious Disease Control,
Stockholm, Sweden2
Received 17 September 1998/Returned for modification 9 November
1998/Accepted 8 December 1998
The newly formulated Mycobacterium kansasii AccuProbe
was evaluated, and the results obtained with the new version were
compared to the results obtained with the old version of this test by
using 116 M. kansasii strains, 1 Mycobacterium
gastri strain, and 19 strains of several mycobacterial species.
The sensitivity of this new formulation was 97.4% and the specificity
was 100%. Still, three M. kansasii strains were missed by
this probe. To evaluate the variability within the species, genetic
analyses of the hsp65 gene, the spacer sequence between the
16S and 23S rRNA genes, and the 16S rRNA gene of several M. kansasii AccuProbe-positive strains as well as all
AccuProbe-negative strains were performed. Genetic analyses of the one
M. gastri strain from the comparative assay and of two
further M. gastri strains were included because of the
identity of the 16S rRNA gene in M. gastri to that in
M. kansasii. The data confirmed the genetic heterogeneity
of M. kansasii. Furthermore, a subspecies with an
unpublished hsp65 restriction pattern and spacer sequence
was described. The genetic data indicate that all M. kansasii strains missed by the AccuProbe test belong to one
subspecies, the newly described subspecies VI, as determined by the
hsp65 restriction pattern and the spacer sequence. Since the M. kansasii strains that are missed are rare and all
M. gastri strains are correctly negative, the new
formulated AccuProbe provides a useful tool for the identification of
M. kansasii.
*
Corresponding author. Mailing address:
Forschungszentrum Borstel, National Reference Center for Mycobacteria,
D-23845 Borstel, Germany. Phone: 49-4537-188658. Fax:
49-4537-188311. E-mail: erichter{at}fz-borstel.de.
Journal of Clinical Microbiology, April 1999, p. 964-970, Vol. 37, No. 4
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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