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Results obtained with the different susceptibility methods used to test the 18 IRT-producing E. coli isolates
| Method | % (no.) of isolates |
||
|---|---|---|---|
| Susceptible | Intermediate | Resistant | |
| Microdilution (2:1)a | 0 | 77.8 (14) | 22.2 (4) |
| Agar dilution (2:1)a | 11.1 (2) | 50 (9) | 38.9 (7) |
| Agar dilution (2 mg/liter)b | 0 | 27.8 (5) | 72.2 (13) |
| Disk diffusion (10 μg) | 5.5 (1) | 33.3 (6) | 61.2 (11) |
Fixed ratio of amoxicillin/clavulanate.
Fixed concentration of clavulanate.
