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Table 4 Antimicrobial susceptibility testing of Gram-negative nonfermenters from positive blood cultures by PR1 (A)a or PR2 (B)a

From: A new rapid method for direct antimicrobial susceptibility testing of bacteria from positive blood cultures

Antimicrobial agent

No. of very major errors

No. of major errors

No. of minor errors

AST agreement

Total

A

Amikacin (AMK)

0/3

0/10

0/13

13 (100 %)

13

Colistin (COL)

1/1 (100 %)

1/12 (8.3 %)

0/13

11 (84.6 %)

13

Gentamicin (GM)

1/2 (50 %)

1/11 (9.1 %)

0/13

11 (84.6 %)

13

Levofloxacin (LEV)

1/9 (11.1 %)

0/4

2/13 (15.4 %)

10 (76.9 %)

13

Total (%)

3/15 (20 %)

2/37 (5.4 %)

2/52 (3.8 %)

45 (86.5 %)

52

B

Amikacin (AMK)

0/4

0/10

0

14 (100 %)

14

Colistin (COL)

0/0

0/14

0

14 (100 %)

14

Gentamicin (GM)

1/3 (33.3 %)

2/11 (18.2 %)

1/14 (7.1 %)

10 (71.5 %)

14

Levofloxacin (LEV)

0/9

0/5

2/14 (14.3 %)

12 (85.7 %)

14

Total (%)

1/16 (6.2 %)

2/40 (5 %)

3/56 (5.3 %)

50 (89.3)

56

  1. aUsing the results from the susceptibility testing of the bacteria by Vitek 2 as reference. In case of discrepancies, the results for the susceptibility testing were confirmed by E-test. Data are numbers (with percentages) of bacterial isolates for which the antimicrobial susceptibility testing was concordant/correct or erroneous by PR1 (A) or PR2 (B)