TABLE 4.

Changes in antimicrobial resistance patterns in S. aureus over time

Antimicrobial	% Resistant in yr:
	1986	1991	1994	1996	2002
Penicillin	94.9	97.1	92.3	92.1	89.3
Oxacillin	1.5	11.2	16.6	17.9	31.2
Erythromycin	7	24.5	33.9	24.2	31.7
Clindamycin	0	6.4	20.6	18.7	20.1
Gentamicin	5.2	14.1	19.3	16.4	16.9
Rifampin	1.1	4.9	8.7	7	1.8
Cotrimoxazole	NDa	ND	0.5	1.1	2.1
Chloramphenicol	5.2	2	18.9	1.2	2.5
Ciprofloxacin	0.6	16.6	20.6	19.9	33.9
Vancomycin	0	0	0	0	0
Teicoplanin	0	0	0	0	0
Linezolid	ND	ND	ND	ND	0
Q/Db	ND	ND	ND	ND	0

^aND, not determined.

^bQ/D, quinupristin/dalfopristin.