TABLE 2.

Minimum inhibitory concentrations (MIC) for K. pneumoniae mutant ΔICE containing control plasmid or plasmids encoding YbtPQ or YbtX in the presence or absence of reserpine (RP).

Strain	MIC for antibiotic μg/ml*: Mean (Range)
	Tetracycline No RP	Tetracycline + RP	Streptomycin No RP	Streptomycin + RP
ΔICE + pCtrl	2.1 (1.5–2.8)	1.6 (1.5–2)	0.51 (0.3–0.75)	0.43 (0.3–0.5)
ΔICE + pPQ	4.2 (3–5.5)	2.1 (1.5–3)	1.9 (1.8–2)	0.67 (0.62–0.7)
ΔICE + pYbtX	1.8 (1.7–2)	1.6 (1.5–1.8)	0.66 (0.5–0.75)	0.38 (0.3–0.5)

*range tested using E-test strips (3 replicates): tetracycline 0.016–256 μg/ml, streptomycin 0.064–1024 μg/ml.