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In vitro susceptibility studies of vancomycin-resistant Enterococcus faecalis

Open access
Sahm, D F, Kissinger, J, Gilmore, M S, Murray, P R, Mulder, R, Solliday, J, Clarke, B·1989·Antimicrobial Agents and Chemotherapy

Abstract

Vancomycin resistance exhibited by Enterococcus faecalis isolates V583, V586, and V587 is described. The vancomycin MICs ranged from 32 to 64 micrograms/ml. Although resistant to vancomycin, the isolates were susceptible to teicoplanin (MIC, less than or equal to 0.5 micrograms/ml). Such a glycopeptide susceptibility profile has not been previously described for E. faecalis. Time kill studies showed that vancomycin resistance adversely affected the synergistic activity that vancomycin and aminoglycoside combinations usually demonstrate against enterococci. However, the ability to detect vancomycin resistance varied with the susceptibility testing method used. Whereas broth microdilution, broth macrodilution, and agar dilution methods detected resistance, disk-agar diffusion and the AutoMicrobic system Gram-Positive GPS-A susceptibility card (Vitek Systems Inc., Hazelwood, Mo.) did not. To detect vancomycin resistance reliably and establish the incidence of such E. faecalis isolates, adjustments in some susceptibility testing methods may be necessary.

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Metadata

Authors
Sahm, D. F., Kissinger, J., Gilmore, M. S., Murray, P. R., Mulder, R., Solliday, J., & Clarke, B.
Venue
Antimicrobial Agents and Chemotherapy
Published
1989-09
Volume
33
Issue
9
Pages
1588-1591
ISSN
  • 0066-4804 (ISSN-L)
  • 1098-6596
OpenAlex
W1985725647
Cited by
497
References
0
FWCI
9.22
Type
journal article
Language
en
Open access
green

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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