Table 2.
Phenotypic characterization of Enterobacterales species included in the study and likelihood of deduction of in vitro antibiotic susceptibility according to conventional culture-based results
| Species | Phenotypic results based on fast-track diagnostics | Likelihood of deduction of in vitro antibiotic susceptibility | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| CTX-M-p | CA-p | CTX-M-CA-np | TZP | CAZ | FEP | C/T | CZA | AK | |||
| AmpC-p | AmpC/ESBL-p | AmpC/ESBL-np | |||||||||
| E. coli 68.2(161) | 20.5 (33) | - | - | - | - | 84.8 (28) | 30.3 (10) | 9.1 (3) | 97 (32) | 100 (33) | 75.8 (25) |
| - | - | 0.6 (1) | - | 78.9 (127) | 90.6 (116) | 99.2 (127) | 100 (128) | 100 (128) | 100 (128) | 100 (128) | |
| K. pneumoniae 18.2(43) | 23.3 (10) | - | - | - | - | 40 (4) | 0 | 0 | 90 (9) | 100 (10) | 90 (9) |
| - | 20.9 (9) | - | - | - | 0 | 0 | 0 | 0 | 88.9 (8) | 44.4 (4) | |
| - | - | 7 (3) | - | 48.8 (21) | 75 (18) | 87.5 (21) | 100 (24) | 95.8 (23) | 100 (24) | 100 (24) | |
| Other Enterobacterales 13.6(32) | |||||||||||
| E. cloacae 4.2(10) | - | - | - | 20 (2) | 80 (8) | 80 (8) | 80 (8) | 80 (8) | 80 (8) | 100 (10) | 100 (10) |
| K. aerogenes 3(7) | - | - | 57.1 (4) | 14.3 (1) | 28.6 (2) | 28.6 (2) | 28.6 (2) | 85.7 (6) | 71.4 (5) | 100 (7) | 100 (7) |
| K. oxytoca 1.3(3) | - | - | - | - | 100 (3) | 100(3) | 100 (3) | 100 (3) | 100 (3) | 100 (3) | 100 (3) |
| P. mirabilis 1.3(3) | - | - | - | - | 100 (3) | 100 (3) | 100 (3) | 100 (3) | 100 (3) | 100 (3) | 100 (3) |
| S. marcenscens 0.9(2) | - | - | 50 (1) | - | 50 (1) | 50 (1) | 50 (1) | 100 (2) | 100 (2) | 100 (2) | 50 (1) |
| Citrobacter spp 0.9(2) | - | - | - | - | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) |
| P. agglomerans 0.9(2) | - | - | - | - | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) | 100 (2) |
| M. morganii 0.4(1) | - | - | - | - | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) |
| Salmonella spp 0.4(1) | - | - | - | - | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) | 100 (1) |
| H. alvei 0.4(1) | - | - | 100 (1) | - | - | 100 (1) | 0 | 100 (1) | 0 | 100 (1) | 100 (1) |
All data are shown as relative (%) and absolute (n) frequencies if not otherwise stated
Abbreviations: CTX-M-p CTX-M-producer, CA-p main-carbapenemases-producer, CTX-M-CA-np CTX-M-and-main-carbapenemases-non-producer, AmpC-p AmpC β-lactamase-producer, AmpC/ESBL-p AmpC/extended-spectrum β-lactamase-producer, AmpC/ESBL-np AmpC/extended-spectrum β-lactamase-non-producer, TZP piperacillin-tazobactam, FEP cefepime, C/T ceftolozane-tazobactam, CZA ceftazidime-avibactam, CAZ ceftazidime, AK amikacin