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. 1990 Sep;34(9):1821-3.
doi: 10.1128/AAC.34.9.1821.

Ampicillin-resistant enterococcal species in an acute-care hospital

S E Oster  1 , V A Chirurgi, A A Goldberg, S Aiken, R E McCabe
Affiliations

Ampicillin-resistant enterococcal species in an acute-care hospital

S E Oster et al. Antimicrob Agents Chemother. 1990 Sep.

Abstract

A prospective review of all enterococcal isolates for 13 months showed that 9.0% were resistant to ampicillin (MIC, greater than or equal to 16 micrograms/ml; zone diameter, less than 15 mm), as determined by the Vitek system, disk diffusion, microdilution MIC testing, and macrodilution MIC testing. All were beta-lactamase negative. A total of 19 and 3 resistant isolates were from urine and intravascular sites, respectively. Ampicillin-resistant enterococci appear to be a growing clinical problem.

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