Table 3.

Distribution of β-lactamase production alone or in combination in positive isolates.

Group	β-lactamase positive	ESBL	MBL	AmpC	ESBL + MBL	ESBL + AmpC	MBL + AmpC	ESBL + MBL + AmpC
1 (n = 40)	33	27 (67.5)	20 (50)	13 (32.5)	1 (2.5)	10 (25)	6 (15)	2 (5)
2 (n = 40)	31	27 (67.5)	13 (32.5)	7 (17.5)	6 (15)	3 (7.5)	2 (5)	1 (2.5)
3 (n = 40)	35	22 (55)	10 (25)	9 (22.5)	5 (12.5)	7 (17.5)	2 (5)	1 (2.5)
Total	99	76 (63.3)	43 (35.83)	29 (24.16)	12 (10)	20 (16.66)	10 (8.33)	4 (3.33)

Gene frequencies are presented as absolute numbers with percentage in parentheses.