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Journal of Clinical Microbiology logoLink to Journal of Clinical Microbiology
. 1991 Oct;29(10):2335–2337. doi: 10.1128/jcm.29.10.2335-2337.1991

Vancomycin susceptibility and identification of motile enterococci.

S Vincent 1, R G Knight 1, M Green 1, D F Sahm 1, D M Shlaes 1
PMCID: PMC270325  PMID: 1939593

Abstract

Thirty-seven clinical isolates of Enterococcus gallinarum and Enterococcus casseliflavus and three type or reference strains of the species were studied with respect to vancomycin susceptibility and key identification characteristics. With the exception of one clinical isolate of E. casseliflavus (MIC, 4 micrograms/ml), MICs of vancomycin were 8 to 32 micrograms/ml. The type strain of E. gallinarum, NCDO 2313, and five of the clinical isolates had similar penicillin-binding protein profiles and shared 90 to 100% DNA homology. Two isolates, identified as E. gallinarum by conventional tests, were shown to be non-pigment-producing E. casseliflavus on the basis of penicillin-binding protein profile and DNA homology. The type and reference strains of E. casseliflavus, ATCC 25788 and ATCC 25789, were nonmotile in our experiments. However, both shared 65 to 100% DNA homology with each other and with five clinical isolates of E. casseliflavus. These data suggest that the MICs of vancomycin observed for strains of E. gallinarum and E. casseliflavus are higher than those usually associated with other enterococci and may be a common property of these species. Additionally, pigment production and motility may occasionally be misleading criteria for definitive identification of these organisms.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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