Table 2. Bacitracin and neomycin susceptibility of MRSA USA300 and other MRSA isolates*.

Bacitracin/neomycin	MRSA USA300 (MICs of bacitracin, neomycin, and polymyxin B)†			Other MRSA
	Kyoto University Hospital	Nagoya Medical Center	ATCC type strains
R/R	9 (400, 128, 200–400)	0	BAA1717 (400, 128, 400)	0
R/S	0	1 (400, 0.25, 400)		0
S/R	0	0		11
I/S	0	0		1
S/I	0	0		132
S/S	9 (6.25–12.5, 0.25, 400)	0	BAA1556 (6.25, 0.25, 400)	96
Total	18	1	2	240

*MRSA, methicillin resistant Staphylococcus aureus; ATCC, American Type Culture Collection (Manassas, VA, USA); R, resistant; S, susceptible; I, intermediate resistance.
†MICs are expressed as units/mL for bacitracin and polymyxin B and in μg/mL for neomycin.