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Table 2 Microdilution and Etest discrepancy rates for polymyxin B and Colistin and 78 carbapenem-resistant P. aeruginosa isolates.

From: Comparison of disc diffusion, Etest and broth microdilution for testing susceptibility of carbapenem-resistant P. aeruginosa to polymyxins

Antimicrobial agents

No. (%) aof discrepancies

 

Very Major Error

Major error

Minor

Polymyxin B

1 (1,2%)

_

38 (48,7%)

Polymyxin E

_

__

5 (6,4%)

  1. aUnacceptable levels are show in bold. They are ≥ 3% for major errors as recommended in CLSI document M23 [15].