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Updated: Aug 7, 2026

A 1.5 Hour Procedure for Identification of Enterococcus Species Directly from Blood Cultures
Published on: February 10, 2011
Ampicillin-resistant enterococcal species in an acute-care hospital
S E Oster1, V A Chirurgi, A A Goldberg
1Medical Service, Veterans Administration Medical Center, Martinez, California 94553.
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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