TABLE 2.

Relative amounts of cell-associated HA capsule and cysteine protease activity of SP268 and its isogenic mutants

Strain	Amt of HAa	Cysteine protease activitya
SP268 (wt)	100 ± 14.3	100 ± 5.1
LuxS−	52.3 ± 10.9b	16 ± 2.7b
SpeB−	NDc	3.2 ± 1.9b
HasA−	2.7 ± 0.45b	ND

^aThe amounts of cell-associated capsule or cysteine protease activity were measured as described in Materials and Methods. Data are presented as the percent of the cell-associated capsule (fg/CFU) or cysteine protease activity of the control (SP268) ± standard error of the mean.

^bStatistically significant difference compared to SP268 (P < 0.05).

^cND, not determined.