Table 5 Characteristics of colistin resistant strains
Characteristics | Escherichia coli | Klebsiella pneumoniae |
|---|---|---|
Number of isolates tested | 179 | 20 |
Colistin resistant by MIC determination | 4 (2.2%) | 2 (10%) |
Specimen types of colistin resistant bacteria | Urine for all isolates | Urine for all isolates |
In-patient/out-patient | Inpatient- 2 Outpatient- 2 | Inpatient- 2 |
Colistin resistance (MIC µg/ml) | 4 µg/ml-3 8 µg/ml-1 | 8 µg/ml-1 16 µg/ml-1 |
mcr-1 plasmid detected in colistin resistant | 3 | 0 |
mcr-1 chromosome detected in colistin resistant | 2 | 0 |
mcr-1 both plasmid and chromosome detected in colistin resistant | 2 | 0 |
ESBL producer | 2 | 2 |
Carbapenem resistance isolates | 1 | 1 |
MBL producer | 1 | 1 |
KPC producer | 0 | 0 |
Isolates with MIC break-point (2 µg/ml) (colistin sensitive) | 18 | 0 |
mcr-1 plasmid detected in colistin sensitive | 5 | 0 |
mcr-1 chromosome detected in colistin sensitive | 12 | 0 |
mcr-1 both plasmid and chromosome detected in colistin sensitive | 3 | 0 |