Table 3.
Checkerboard fractional inhibitory concentration results and comparison of MICs obtained from checkerboard and Etest assays at 20 μg/ml PAβN on E. coli strain MG1655a
| Antibiotic | Etest |
CB |
|||||
|---|---|---|---|---|---|---|---|
| MIC (μg/ml) | MIC+ (μg/ml) | % difference | MIC (μg/ml) | MIC+ (μg/ml) | % difference | FIC | |
| NAL | 1.67 (0.29) | 0.38 (0.00) | 23 | 3.3 (1.4) | 0.31 (0) | 9 | 0.078 (0.016) |
| CIP | 0.003 (0.001) | 0.007 (0.001) | 233 | 0.032 (0.000) | 0.043 (0.018) | 134 | 1.80 (0.58) |
a
MIC denotes MIC in the absence of PAβN; MIC+ denotes MIC in the presence of 20 μg/ml PAβN. Numbers in parentheses show standard deviations from three experiments. The percent difference was calculated as MIC+/MIC × 100. CB, checkerboard; FIC, fractional inhibitory concentration.