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Journal of Clinical Microbiology, June 1998, p. 1539-1543, Vol. 36, No. 6
Department of Medical Microbiology,
University of Zürich, CH-8028 Zürich,
Switzerland,1 and
Culture
Collection, University of Göteborg, S-41346 Göteborg,
Sweden2
Received 9 February 1998/Returned for modification 9 March
1998/Accepted 13 March 1998
During a 2-year period, 10 strains of Arthrobacter
cumminsii were isolated in or received by a Swiss routine
clinical bacteriology laboratory, and 5 further isolates were referred
to a Swedish bacteriology reference center over a 5-year period, making
A. cumminsii the most frequently encountered
Arthrobacter species in these two laboratories. The present
report outlines the clinical features of the 15 A. cumminsii strains and presents an extended biochemical
characterization of this microorganism. A. cumminsii exhibits a unique cellular fatty acid pattern with the consistent presence of C14:0i and C14:0 fatty
acids as well as relatively large amounts of
C16:0i and C16:0 fatty acids
usually not seen in other Arthrobacter spp. Sodium dodecyl
sulfate-polyacrylamide gel electrophoresis was found to be a useful
tool for confirmation of the identification of A. cumminsii. The MICs of 39 antimicrobial agents were determined,
and it was demonstrated that aminoglycosides and quinolones had only
weak activities against A. cumminsii strains, in contrast
to their activities against most other coryneform bacteria. As a result
of the extended characterization of A. cumminsii, an
emended description of this species is presented. Due to the lack of
A. cumminsii in established identification systems, it is
most likely that this species is underdiagnosed in many routine clinical bacteriology laboratories.
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Characteristics of Arthrobacter cumminsii, the Most
Frequently Encountered Arthrobacter Species in Human
Clinical Specimens
*
Corresponding author. Mailing address: Department of
Medical Microbiology, University of Zürich, Gloriastrasse 32, CH-8028 Zürich, Switzerland. Phone: 41-1-634-2701. Fax:
41-1-634-4906. E-mail: funke{at}immv.unizh.ch.
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