TABLE 2.
Correlation between FQ and β-lactam susceptibilities using centralized in vitro surveillance data
| Organism | β-Lactam susceptibilitya | n | No. (%) of susceptible isolates
|
|
|---|---|---|---|---|
| Levofloxacin | Ciprofloxacin | |||
| E. coli | CAZ-S | 697 | 672 (96.4) | 670 (96.1) |
| CAZ-NS | 12 | 2 (16.7) | 2 (16.7) | |
| K. pneumoniae | CAZ-S | 545 | 532 (97.6) | 528 (96.9) |
| CAZ-NS | 39 | 23 (59.0) | 18 (46.2) | |
| P. mirabilis | CAZ-S | 410 | 390 (95.1) | 376 (91.7) |
| CAZ-NS | 3 | 1 (33.3) | 1 (33.3) | |
| E. cloacae | CAZ-S | 232 | 225 (97.0) | 219 (94.4) |
| CAZ-NS | 91 | 80 (87.9) | 66 (72.5) | |
| Citrobacter spp. | CAZ-S | 159 | 151 (95.0) | 147 (92.5) |
| CAZ-NS | 45 | 42 (93.3) | 40 (88.9) | |
| S. marcescens | CAZ-S | 188 | 182 (96.8) | 175 (93.1) |
| CAZ-NS | 8 | 4 (50.0) | 0 (0.0) | |
| E. aerogenes | CAZ-S | 149 | 147 (98.7) | 146 (98.0) |
| CAZ-NS | 34 | 29 (85.3) | 27 (79.4) | |
| Providencia spp. | CAZ-S | 70 | 46 (65.7) | 44 (62.9) |
| CAZ-NS | 2 | 1 (50.0) | 1 (50.0) | |
| P. aeruginosa | CAZ-S | 377 | 294 (78.0) | 294 (78.0) |
| CAZ-NS | 87 | 37 (42.5) | 36 (41.4) | |
| IPM-S | 397 | 307 (77.3) | 307 (77.3) | |
| IPM-NS | 67 | 24 (35.8) | 23 (34.3) | |
a
β-Lactam susceptibility (S) based on ceftazidime (CAZ) for Enterobacteriaceae and CAZ and imipenem (IPM) for P. aeruginosa. NS, nonsusceptible (includes intermediate and resistant strains [16]).