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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.