TABLE 1.

Evaluation of the BYG Carba test, β Carba test, Rapidec Carba NP test, and Neo-Rapid Carb screen test against 198 Enterobacteriaceae isolates

Enterobacteriaceae group	Resistance mechanism	No. of isolates	MIC range (μg/ml) for:			Test results (no.) fora:
			Meropenem	Imipenem	Ertapenem	BYG		BCT			RCNP				NRCK
						P	N	P	D	N	P	D	N	NI	P	D	N	NI
CPE	KPC-3	8	4–>32	16–>32	12–>32	8	0	7	1	0	8	0	0	0	8	0	0	0
	NDM-1	18	3–>32	2–>32	6–>32	18	0	18	0	0	18	0	0	0	18	0	0	0
	VIMb	13	1–32	4–>32	0.19–>32	13	0	13	0	0	13	0	0	0	13	0	0	0
	OXA-48	69	0.19–>32	0.38–>32	0.25–>32	69	0	67	2	0	60	9	0	0	57	9	2	1
	NDM-1 + OXA-48	2	>32	>32	>32	2	0	2	0	0	2	0	0	0	2	0	0	0
	KPC-2 + VIM-1	1	>32	>32	>32	1	0	1	0	0	1	0	0	0	1	0	0	0
	Total CPE	111	0.19–>32	0.38–>32	0.19–>32	111	0	108	3	0	102	9	0	0	99	9	2	1
Non-CPE	ESBL	29	0.016–24	0.125–3	0.006–>32	0	29	0	0	29	0	6	23	0	0	2	26	1
	AmpC overexpression	30	0.023–12	0.125–32	0.19–>32	1	29	0	1	29	0	5	25	0	0	1	25	4
	ESBL and AmpC overexpression	13	0.047–4	0.19–16	0.094–>32	0	13	0	0	13	0	2	11	0	0	1	12	0
	Narrow spectrum β-lactamases	15	0.012–4	0.19–2	0.003–24	0	15	0	1	14	0	1	14	0	0	0	15	0
	Total non-CPE	87	0.012–24	0.125–32	0.003–>32	1	86	0	2	85	0	14	73	0	0	4	78	5

^aBYG, BYG Carba test, BCT, β Carba test, RCNP, Rapidec Carba NP test, NRCK, Neo-Rapid Carb screen kit; P, positive; N, negative; D, doubtful; NI, noninterpretable.

^bVIM-1 (n = 12), VIM-4 (n = 1).