Table 1.
Microbiologic characteristics of ST131 and non-ST131 E. coli fecal isolates from long-term care facility residents colonized with fluoroquinolone-resistant Escherichia coli.
| Variable | ST131 (n = 29) |
Non-ST131 (n = 8) |
P value |
|---|---|---|---|
| Median levofloxacin MIC (IQR) | 24 (16, 32) | 20 (8, 32) | 0.58 |
| Median no. of gyrA mutations (IQR)a | 2 (2, 2) | 2 (1, 2) | 0.01 |
| Median no. of parC mutations (IQR)b | 2 (2, 2) | 1 (0, 1) | < 0.001 |
| OST-positive status, no. (%) | 6 (21) | 4 (50) | 0.17 |
NOTE. IQR, interquartile range; OST, organic solvent tolerance.
a
One ST131 isolate could not be characterized in regard to gyrA mutations.
b
One ST131 isolate could not be characterized in regard to parC mutations.