TABLE 1.

Clumping of several S. aureus strains in various media^a

Resultb in:
Strain	Purified rabbit fibrinogen in AF filtrate at:				90% PLA2-depleted AF	90% Human plasma
	0 μg/ml	10 μg/ml	270 μg/ml	2.7 mg/ml
3	156 ± 29	55 ± 12	31 ± 7	37 ± 31	51 ± 10	39 ± 13
5A	202 ± 58	181 ± 36	82 ± 20	36 ± 12	38 ± 13	47 ± 19
18	257 ± 60	31 ± 3	16 ± 6	9	22 ± 2	2.5
RN450	165 ± 9	141 ± 35	58 ± 24	18	24 ± 12	13.5
Newman ClfA−	173 ± 35	135 ± 27	17 ± 4	7 ± 2	34 ± 8	1
Newman ClfA+	194 ± 54	27 ± 8	5 ± 2	2 ± 1	23 ± 7	0

^aSeveral strains of S. aureus at 10⁸ bacteria/ml were incubated in the media indicated for 60 min, and CFU were assessed. 

^bExpressed as the percentage of the CFU of the initial inoculum. Each result is the mean ± SEM of at least three independent determinations.