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Frequency of resistance of P. aeruginosa PAO1 to cefiderocol and ceftazidime
| Drug | Frequency of resistancea at: |
|
|---|---|---|
| 4× MIC | 10× MIC | |
| Cefiderocol | 2.9 × 10−8 | <7.1 × 10−9 |
| Ceftazidime | 3.1 × 10−7 | 3.4 × 10−7 |
Number of appeared colonies/number of inoculum. Here, inoculum was 1.4 × 108, and the frequency of resistance should be 7.1 × 10−9 if a resistant colony appears. So, in the case of no resistant colonies, the frequency of resistance should be <7.1 × 10−9.
