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Table 3 Correlation of the results of disk diffusion (DD) and automated systems in susceptibility testing to the antibiotics tested: Numbers of discordances.

From: Detecting imipenem resistance in Acinetobacter baumannii by automated systems (BD Phoenix, Microscan WalkAway, Vitek 2); high error rates with Microscan WalkAway

  Discordances between DD and the three automated systems Discordances between the three automated systems
  DD/Phoenix DD/MicroScan DD/Vitek2 Vitek2/MicroScan Vitek2/Phoenix Phoenix/MicroScan
Antibiotics Major* Minor** Major* Minor** Major* Minor** Major* Minor** Major* Minor** Major* Minor**
MEM 3 30 7 62 15 72 3 62 4 62   31
PRL   4   4   3   1   1   2
CAZ   3 3 10 1 3 2 13 1 2 1 13
FEP 9 41 4 43 7 34 1 16 3 16 1 20
CTX 1 4 1 6 1 4 1 2 1 2 1 2
CIP 1 17 7 9 9 14   11   19   15
LEV 1 25   24 1 24   21   22   17
CN 7 8 4 5 5 3 1 5 5 6 3 7
TE 5 7 8 5 11 11 3 10 2 18 4 10
SXT 15 70 11 4 23 60 17   13   12  
  1. * Discordances were defined as "major" when A. baumannii was found to be susceptible by one method/system and resistant with the other method/system.
  2. ** Discordances were defined as "minor" when A. baumannii was found to be susceptible or resistant by one method/system and intermediate with the other method/system.
  3. *** Imipenem was not included in the table; types of errors in susceptibility testing to imipenem by all systems can be derieved in detail from Table 1.