Molecular Epidemiology of Carbapenem-Resistant Klebsiella pneumoniae in a Tertiary Hospital in Northern China

Table 3

Imipenem MICs of different STs of 45 CRKP isolates.

Resistance profile	N (%)	No. of isolates by MIC (μg/mL)							MIC50 (μg/mL)	MIC90 (μg/mL)
		4	8	16	32	64	128	256
ST11	22 (48.9)	8	3	3	5	2	0	1	8	64
ST307	4 (8.9)	3	0	0	0	1	0	0	4	64
ST323	4 (8.9)	1	3	0	0	0	0	0	8	8
ST76	3 (6.7)	0	2	1	0	0	0	0	8	16
ST15	2 (4.4)	1	1	0	0	0	0	0	4	8
ST625	2 (4.4)	0	0	0	2	0	0	0	32	32
Others-ST	8 (17.8)	4	2	0	1	0	0	1	4	256

ST, sequence type; MIC, the minimal inhibitory concentration; μg/ml, micrograms per milliliter; MIC₅₀, minimum inhibitory concentration for 50% of the isolates; MIC₉₀, minimum inhibitory concentration for 90% of the isolates.