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Journal of Clinical Microbiology, 09 1997, 2235-2242, Vol 35, No. 9
RW Wilson, VA Steingrube, BA Brown, Z Blacklock, KC Jost Jr, A McNabb, WD Colby, JR Biehle, JL Gibson and RJ Wallace Jr
Amikacin resistance, rare among nocardiae, was observed in 58 clinical
isolates of nocardiae. All of these isolates hydrolyzed hypoxanthine, and
75 to 100% utilized citrate, D-galactose, and D-trehalose as sole carbon
sources. Based on utilization of I-erythritol, D-glucitol, i-myo- inositol,
D-mannitol, and ribitol and susceptibility to amoxicillin- clavulanic acid,
the 58 isolates were separable into four groups. One group was negative for
I-erythritol and ribitol and included all the isolates belonging to
Nocardia asteroides complex antibiogram type IV. The remaining three groups
were positive for I-erythritol and ribitol and were grouped within Nocardia
transvalensis. The group that included the type strain was designated N.
transvalensis sensu stricto, and the other two groups were designated new
taxons 1 and 2. PCR-restriction fragment length polymorphism (RFLP)
analysis of a 439-bp segment of the 65-kDa heat shock protein gene with
XhoI and HinfI produced identical patterns for 53 (91%) and 58 (100%)
isolates, respectively, and differentiated them from all other Nocardia
taxa. NarI- and HaeIII- derived RFLP patterns clearly differentiated each
of the four biochemically defined taxa. These four groups were also
distinguishable by using the chromogenic substrates in Dade MicroScan test
panels. By high-performance liquid chromatography, these isolates exhibited
the same unique mycolic acid-ester elution patterns that differed from
those of all other clinically significant nocardiae. Gas-liquid
chromatographic analysis of fatty acids also produced similar patterns for
all isolates that distinguished them from all other Nocardia taxa, but did
not differentiate the four taxa within the complex. We propose the
designation N. transvalensis complex for these four groups of nocardiae,
pending further genetic evaluation.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Recognition of a Nocardia transvalensis complex by resistance to aminoglycosides, including amikacin, and PCR-restriction fragment length polymorphism analysis
Center for Pulmonary and Infectious Disease Control, The University of Texas Health Center at Tyler, 75710-2003, USA.
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