Table 4. Sensitivity and specificity obtained by VITEK2 and Phoenix100 ESBL algorythms in Enterobacteriaceae, E. coli and Klebsiella spp.
| # n.i. | # false / total positive | # false / total negative | Sensitivity (%) | Specificity (%) | |
|---|---|---|---|---|---|
| VITEK2 | |||||
| Enterobacteriaceae | 24 (8) | 25/173 | 2/48 | 99 | 64.8 |
| E. coli | 3 (3) | 6/125 | 0/42 | 100 | 87.5 |
| Klebsiella spp. | 6 (3) | 18/46 | 2/6 | 93.3 | 18.2 |
| Phoenix 100 | |||||
| Enterobacteriaceae | 1 (0) | 22/165 | 15/79 | 90.5 | 74.4 |
| E. coli | 0 | 6/125 | 3/45 | 97.5 | 87.5 |
| Klebsiella spp. | 1 (0) | 15/38 | 10/19 | 69.7 | 37.5 |
n.i. = non-interpretable (# of n.i. ESBL+ isolates)