Table 4.

Comparison of mCIM, sCIM and CIM-s in the Detection of Carbapenemase

PCR (n)	Zone (mm)			Positive (n, %)			Indeterminate (n, %)
	mCIM	sCIM	CIM-s*	mCIM	sCIM	CIM-s*	mCIM	sCIM	CIM-s*
Positive (79)	6–10	6–25	6–20	79(100)	73(92.4)	77(97.5)	0(0)	6(7.6)	2(2.5)
CphA (68)	6–10	6–25	6–20	68(100)	62(91.2)	66(97.1)	0(0)	6(8.2)	2(2.9)
KPC-2 (6)	6	6	6	6(100)	6(100)	6(100)	0(0)	0(0)	0(0)
NDM-1 (2)	6	6–10	6	2(100)	2(100)	2(100)	0(0)	0(0)	0(0)
KPC-2+CphA (3)	6	6	6	3(100)	3(100)	3(100)	0(0)	0(0)	0(0)
Negative (52)	21–23	26–30	21–23	0(0)	0(0)	0(0)	0(0)	0(0)	0(0)

Notes: *The results were determined after incubation at 35°C in ambient air for 4h.

Abbreviations: mCIM, modified carbapenem inactivation method; sCIM, simplified carbapenem inactivation method; CIM-s, carbapenem inactivation method using supernatant.