Table 4.

Comparison of the performances of the REBA-EAC assay versus sequence analysis for detecting β-lactamase genes in the 327 ESBL-phenotypically confirmed isolates.

Class of β-lactamase (no. of isolates)	Type of β-lactamase gene		Microorganism	No. of isolates
	REBA-EAC assay	Sequence analysis
ESBL (382)	CTX-M-1/2	CTX-M-1	E. coli	97
	CTX-M-1/2	CTX-M-1	K. pneumoniae	3
	CTX-M-1/2	CTX-M-1	K. oxytoca	1
	CTX-M-1/2	CTX-M-1	E. aerogenes	1
	CTX-M-9	CTX-M-9	E. coli	86
	CTX-M-9	CTX-M-9	K. pneumoniae	49
	CTX-M-9	CTX-M-9	P. mirabilis	4
	CTX-M-9	CTX-M-9	E. cloacae	2
	CTX-M-9	CTX-M-9	P. mirabilis	4
	CTX-M-1/2 + CTX-M-9	CTX-M-1 + CTX-M-9	E. coli	2
	CTX-M-1/2 + CTX-M-9	CTX-M-1 + CTX-M-9	K. pneumoniae	1
	TEM	TEM-3	K. pneumoniae	3
	TEM	TEM-22	E. coli	21
	TEM	TEM-22	K. pneumoniae	5
	TEM	TEM-46	E. coli	9
	TEM	TEM-46	K. pneumoniae	5
	TEM	TEM-52	E. coli	25
	TEM	TEM-52	K. pneumoniae	10
	TEM	TEM-66	E. coli	21
	TEM	TEM-66	K. pneumoniae	5
	SHV	SHV-2a	K. pneumoniae	14
	SHV	SHV-5	K. pneumoniae	5
	SHV	SHV-12	K. pneumoniae	10
	SHV	SHV-12	K. oxytoca	2
AmpC β-lactamase (92)	DHA	DHA-1	K. pneumoniae	61
	DHA	DHA-23	K. pneumoniae	8
	DHA	DHA-15	K. pneumoniae	5
	DHA	DHA-3	K. pneumoniae	1
	DHA	DHA-1	E. coli	2
	CMY-2-like	CMY-2	K. pneumoniae	7
	CMY-2-like	CMY-2	E. coli	4
	DHA+CMY-2-like	DHA+CMY-2	K. pneumoniae	2
	ACT	ACT-1	E. coli	1
	ACT	ACT-1	E. aerogenes	1
Carbapenemase (6)	NDM	NDM-1	E. coli	2
	NDM	NDM-1	K. pneumoniae	1
	KPC	KPC-18	E. coli	1
	VIM	VIM-2	E. coli	1
	IMP	IMP-1	K. pneumoniae	1