Table 5.

Results of commercial vancomycin screening plates tested with staphylococcal isolates

Isolate descriptionNo. of plates positive/total no. testeda
Vancomycin MIC, 8 μg/ml8/88/88/88/8
Vancomycin MIC, 4 μg/ml1/3b 1/3b 1/3b 1/3b
Vancomycin MIC, ≤2 μg/ml0/25c 0/250/250/25
Enterococcus faecalis ATCC 51299d 5/55/55/55/5
Enterococcus faecalis ATCC 29212d 0/50/50/50/5
Staphylococcus aureus ATCC 29213d 0/50/50/50/5
Staphylococcus aureus ATCC 25923d 0/50/50/50/5
  • a BBL, Becton Dickinson Microbiology Systems; Hardy, Hardy Diagnostics; PML, PML Microbiologicals; Remel, Remel Diagnostics.

  • b The single positive isolate was S. aureus 966 (from Michigan), for which the vancomycin MIC was 4 μg/ml and for which the teicoplanin MIC was 16 μg/ml.

  • c Includes Mu3 (from Japan; reference MIC = 2 μg/ml).

  • d Quality control isolates. Each isolate was tested five times.