TABLE 2.

CAMP susceptibilities of L. pneumophila strains^a

CAMP	Growth medium	Strain	MIC (μg/ml)	MBC (μg/ml)
PmB	BYE	130b	12.5	25–50
		NU260	6.2	25
	CDM	130b	3.1	25
		NU260	3.1	12.5–25
	0.05 mM Mg2+–CDM	130b	6.2–12.5	25
		NU260	6.2	12.5–25
	0.005 mM Mg2+–CDM	130b	12.5	25
		NU260	6.2	12.5–25
C18G	BYE	130b	16	32
		NU260	8	16–32
	CDM	130b	16	32
		NU260	4–8	8–16
	0.05 mM Mg2+–CDM	130b	16	32
		NU260	4	8–16
	0.005, mM Mg2+–CDM	130b	64	128
		NU260	16	16–32

^aThe bacteria were grown in triplicate to mid-exponential phase in the indicated media and then, after dilution to 5 × 10⁴ CFU/ml, were exposed to PmB or C18G. The incubation medium during all CAMP resistance assays was BYE. Similar MICs and MBCs were obtained in a replicate experiment (data not shown). A range of concentrations indicates the range of MICs of MBCs obtained from triplicate samples.