TABLE 4.

The effect of levofloxacin, rifampin, and erythromycin, at 10 times their MICs, used singly and in combination against Legionella pneumophila L-1033 (pH 6.0)

Antibiotic (concn, μg/ml)	Bacterial killing (log10 CFU/ml)a on assay day:
	1	2	3	4
Control	1.13	1.23	1.41	1.07
Levofloxacin (0.3)	0.47	0.53	0.18	0.12
Rifampin (0.01)	0.40	0.35	0.36	−0.12
Erythromycin (5.0)	0.60	0.36	0.48	0.64
Levofloxacin (0.3) plus rifampin (0.01)	0.40	0.08	0.27	−0.26
Levofloxacin (0.3) plus erythromycin (5.0)	0.45	0.22	0.30	−0.06
Rifampin (0.01) plus erythromycin (5.0)	0.58	0.52	0.84	0.07

^aSee Table 1, footnote a. SEM range for controls and for antibiotic-containing assays is 0.22 to 0.40.