TABLE 6.
Etest MICs compared with reference broth microdilution MICs for 597 isolates of P. aeruginosa from CF patients
| Antimicrobial(s)a | No. (%) of errors
|
No. of isolates tested | Correlation coefficient (r) | Regression slope | |||
|---|---|---|---|---|---|---|---|
| Very major | Major | Minor | Total | ||||
| Amikacin | 0 | 1 (0.2) | 96 (16.6) | 97 (16.8) | 579 | 0.91 | 0.74 |
| Gentamicin | 0 | 3 (0.5) | 159 (27.5) | 162 (28.0) | 578 | 0.89 | 0.74 |
| Tobramycin | 0 | 1 (0.2) | 96 (16.8) | 97 (17.0) | 571 | 0.89 | 0.87 |
| Ticarcillin | 1 (0.2) | 36 (6.4) | 37 (6.5) | 566 | 0.87 | 0.72 | |
| Ticarcillin-clavulanate | 0 | 28 (4.9) | 28 (4.9) | 569 | 0.85 | 0.71 | |
| Piperacillin | 1 (0.2) | 24 (4.2) | 25 (4.4) | 574 | 0.89 | 0.76 | |
| Piperacillin-tazobactam | 2 (0.4) | 24 (4.2) | 27 (4.7) | 470 | 0.88 | 0.75 | |
| Ceftazidime | 2 (0.3) | 3 (0.5) | 70 (12.2) | 75 (13.1) | 572 | 0.91 | 0.64 |
| Aztreonam | 2 (0.4) | 6 (1.1) | 63 (11.5) | 71 (13.0) | 546 | 0.89 | 0.64 |
| Ciprofloxacin | 0 | 5 (1.1) | 117 (24.7) | 122 (25.7) | 574 | 0.86 | 0.59 |
| Imipenem | 0 | 4 (0.7) | 63 (11.4) | 67 (12.1) | 553 | 0.91 | 0.68 |
| Meropenem | 0 | 14 (3.0) | 84 (17.8) | 98 (20.7) | 473 | 0.90 | 0.68 |
| Allb | 8 (0.1) | 149 (2.2) | 748 (11.3) | 906 (13.7) | 6,625 | 0.89 | 0.71 |
a
Ticarcillin-clavulanate, 2 μg/ml; piperacillin-tazobactam, 4 μg/ml.
b
Mean values.