Table 4.
Phenotypic characterization of antimicrobial resistance in the isolated bacterial species, sensitivity, specificity, and positive and negative predictive values of the screening test (N = 80)
| Characteristic | Value |
|---|---|
| ESBL positive, initial screening, n (%) | 80 (100) |
| ESBL positive, confirmatory testing, n (%) | 72 (90) |
| Derepressed mutants, n (%) | 8 (10) |
| AmpC production testing, n (%) | 8/8 (100) |
| AmpC inclusive, n (%) | 0/0 (0) |
| Multidrug-resistant carbapenem- susceptible bacteria species, n (%) | 75/80 (94) |
| Sensitivity of screening method, % | 100 |
| Specificity of screening method, % | 50 |
| Positive predictive value of screening method, % | 90 |
| Negative predictive value of screening method, % | 100 |
AmpC = Class C β-lactamases; ESBL = extended-spectrum β-lactamase.