Table 1.
MICs of ciprofloxacin for E. coli strains according to the isolation source
| MIC (µg/mL) | Clinical specimens N = 82, n (%) | Healthy carriers N = 176 n (%) | Hospital wastewater N = 33 n (%) | Municipal wastewater N = 34, n (%) | Livestock slaughterhouse wastewater N = 9, n (%) | Poultry slaughterhouse wastewater N = 12, n (%) | Total N = 346, n (%) |
|---|---|---|---|---|---|---|---|
| 0.25 | 29 (35.3) | (89.8) 158 | (48.5) 16 | (85.2) 29 | 6 (6.66) | (91.7) 11 | (71.9) 249 |
| 0.5 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| 1a | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| 2 | 0 (0.0) | (2.9) 5 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | (1.5) 5 |
| 4 | 4 (4.9) | (4.6) 8 | (3.0) 1 | (60) 3 | 0 (0.0) | 0 (0.0) | (4.6) 16 |
| 8 | (2.4) 2 | (0.5) 1 | 0 (0.0) | (40) 2 | 0 (0.0) | 0 (0.0) | (1.5) 5 |
| 16 | (6.0) 5 | (0.5) 1 | (18.2) 6 | 0 (0.0) | 0 (0.0) | 0 (0.0) | (3.5) 12 |
| 32 | (19.6) 16 | (0.5) 1 | (15.2) 5 | 0 (0.0) | (33.3) 3 | (8.3) 1 | (7.5) 26 |
| 64 | 22 (26.9) | 0 (0.0) | (12.1) 4 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 26 (7.5) |
| 128 | (1.2) 1 | (1.1) 2 | (3.0) 1 | 0 (0.0) | 0 (0.0) | 0 (0.0) | (1.2) 4 |
| 256 | (3.7) 3 | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | (0.8) 3 |
| MIC50 (µg/mL) | 32 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| MIC90 (µg/mL) | 64 | 0.25 | 64 | 4 | 32 | 0.25 | 64 |
aThe resistance breakpoint of ciprofloxacin against E. coli