Table 3.

Antibacterial activities of benzalkonium bromide against clinically isolated S. aureus strains.

Clinically isolated strain	Oxford plate assay		Broth dilution method
	Mean diameter of inhibition zone (SEM ± S) (mm)	Variation coefficients (%)
			MICmedian (μg/mL)
ATCC6538 (control)	18.19 ± 0.90	4.94	1.5
sau33	17.94 ± 0.58	3.25	1.5
sau34	12.38 ± 0.60	4.84	3
Sau41	14.56 ± 0.63	4.36	3
Sau46	18.19 ± 0.50	2.73	1.5
Sau52	16.56 ± 0.39	2.36	2
Sau53	13.25 ± 0.43	3.27	2
Sau54	17.94 ± 0.58	3.25	1.5
Sau55	17.81 ± 0.50	2.79	1.5
Sau56	14.81 ± 0.66	4.45	2
Sau70	17.44 ± 0.53	3.02	1.5
Sau76	15.31 ± 0.56	3.63	1.5
Sau77	16.94 ± 0.53	3.11	2
Sau78	16.56 ± 0.46	2.8	1.5
Sau80	16.83 ± 0.47	2.8	1.5
Sau81	14.75 ± 0.56	3.79	1.5
Sau82	14.94 ± 0.58	3.9	2
Sau83	15.00 ± 0.61	4.08	2
Sau133	14.56 ± 0.63	4.36	2
Sau135	14.75 ± 0.43	2.94	2
Sau142	15.19 ± 0.66	4.34	2
Sau143	17.50 ± 0.71	4.04	1.5
Sau149	18.06 ± 0.77	4.25	1.5
Sau155	13.50 ± 0.50	3.7	3
Sau157	17.00 ± 0.50	2.94	1.5
Sau159	16.56 ± 0.46	2.8	1.5
Sau161	16.06 ± 0.63	3.95	1.5
Sau162	18.31 ± 0.61	3.33	1.5
Sau165	14.94 ± 0.68	4.56	1.5
Sau167	16.00 ± 0.61	3.83	1.5