Table 1.
Minimum inhibitory concentrations (MICs) for the three Klebsiella quasipneumoniae strains R55 (March), R58 (April), and R73 (May) isolated from wastewater samples. EUCAST epidemiological cut-offs for K. pneumoniae (ECOFFs, www.eucast.org, accessed on 3 November 2022) relative to the tested antimicrobials are reported
| Antimicrobial | MIC values (mg/L) | ECOFF (R > mg/L) | ||
|---|---|---|---|---|
| R55 | R58 | R73 | ||
| Colistin (COL) | ≤ 0.12 | ≤ 0.12 | ≤ 0.12 | 2 |
| Cefepime (FEP) | 2 | 0.12 | 0.5 | 0.125 |
| Cefotaxime (FOT) | 8 | 2 | 16 | 0.25 |
| Cefotaxime/clavulanic acid (F/C) | 8 | 2 | 2 | 0.25* |
| Cefoxitin (FOX) | 4 | 4 | 4 | 8 |
| Ceftazidime (TAZ) | 64 | 16 | 16 | 1 |
| Ceftazidime/clavulanic acid (T/C) | 32 | 16 | 32 | 1 |
| Ertapenem (ETP) | 0.06 | 0.03 | 0.03 | 0.03* |
| Imipenem (IMI) | 1 | 0.5 | 0.5 | 1 |
| Meropenem (MERO) | 0.06 | 0.06 | ≤ 0.03 | 0.125 |
| Temocillin (TRM) | 16 | 16 | 32 | 8 |
*in the absence of cut-offs for K. pneumoniae, values for Escherichia coli have been used
Resistances are highlighted in bold