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Journal of Clinical Microbiology, May 1996, 1124-1128, Vol 34, No. 5
G Funke, PA Lawson, KA Bernard and MD Collins
A comprehensive study was performed on 25 bacterial clinical isolates
originally identified as Corynebacterium xerosis. Three reference strains
of C. xerosis were also included in the study. On the basis of a variety of
phenotypic characteristics tested, all strains could be divided into two
separate clusters: reference strains ATCC 373 (the type strain of C.
xerosis) and ATCC 7711 showed yellow-pigmented, dry, rough colonies,
fermented 5-keto-gluconate, exhibited strong leucine arylamidase and
alpha-glucosidase activities, produced lactate as the major end product of
glucose metabolism, were susceptible to most of the 19 antimicrobial agents
tested, and showed an inhibition zone around disks containing the
vibriocidal compound O/129. In contrast, the remaining 26 strains including
reference strain NCTC 7243 as well as all clinical isolates formed
white-grayish, dry, slightly rough colonies, did not ferment
5-keto-gluconate, exhibited only weak leucine arylamidase and no
alpha-glucosidase activity, produced large amounts of propionic acid as the
end product of glucose metabolism, and were resistant to most antimicrobial
agents tested, including O/129. Chemotaxonomic (cellular fatty acids,
mycolic acids, and G+C content) and molecular genetic (16S rRNA gene
sequence) investigations revealed that the strains of the second cluster
unambiguously belonged to the species C. amycolatum. Our data suggest that
most strains reported in the literature as C. xerosis are probably
misidentified and correspond to C. amycolatum.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Most Corynebacterium xerosis strains identified in the routine clinical laboratory correspond to Corynebacterium amycolatum
Department of Medical Microbiology, University of Zurich, Switzerland.
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