TABLE 1.

Evaluation of the disk diffusion (1 μg of oxacillin) and agar screen (2 μg of oxacillin per ml) tests on MSA for detection of oxacillin resistance in S. aureus isolates (n = 136)

Presence of the mecA gene	Total no. of isolates	No. of isolates
		Disk diffusion on MSA with zone diam of:		Agar screening on MSA
		<16 mm	≥16 mm	Growth	No growth
mecA positive	54	54	0	53	1
mecA negative	82	2	80	4	78