Table 2.

Minimum inhibitory and bactericidal concentration (MIC/MBC) [mg/mL] of cajeput, lemongrass, tea tree, and thyme essential oils against 27 uropathogenic strains in artificial urine, determined by broth microdilution assay. Median values from three independent measurements are shown.

Bacterial Strain 1	Antibiotic Resistance	Essential Oils
		Cajeput		Lemongrass		Tea Tree		Thyme
		MIC	MBC	MIC	MBC	MIC	MBC	MIC	MBC
Ec ATCC 25922		12.5	12.5	25	25	1.56	1.56	1.56	1.56
Ec CHD1		3.13	3.13	1.56	3.13	1.56	1.56	0.78	1.56
Ec CHD3		3.13	3.13	0.63	6.25	1.56	1.56	0.78	0.78
Ec CHD22		3.13	3.13	25	25	1.56	1.56	1.56	1.56
Ec CHD94		6.25	6.25	25	25	1.56	1.56	1.56	1.56
Ec UTI89		6.25	6.25	25	25	1.56	1.56	0.78	0.78
Ec CHD16	bla CTX-M-15	6.25	12.5	12.5	25	3.13	6.25	3.13	3.13
Ec IR3	blaCTX-M-15, blaTEM-1B	3.13	6.25	1.56	1.56	3.13	3.13	1.56	3.13
Ec H75	bla NDM-1	12.5	12.5	25	25	3.13	3.13	3.13	6.25
Ec 1949820	fluoroquinolone	25	50	50	50	3.13	0.78	3.13	3.13
Ec CDF2	mcr-1	1.56	1.56	1.56	1.56	1.56	1.17	0.78	0.78
Kp 595		3.13	3.13	3.13	3.13	1.56	1.56	1.56	1.56
Kp CHD67		3.13	3.13	3.13	6.25	1.56	1.56	1.56	1.56
Kp CHD99		25	50	50	50	3.13	3.13	25	50
Kp ATCC BAA1705	bla KPC	25	50	25	25	3.13	3.13	6.25	12.5
Kp ATCC BAA2146	bla NDM-1	12.5	50	25	50	6.25	6.25	25	50
Ecl CHD57		25	50	25	25	1.56	3.13	1.56	1.56
Ecl CHD60		3.13	6.25	6.25	12.5	0.78	1.56	0.78	0.78
Pm CHD72		25	50	25	25	6.25	6.25	25	25
Pm CHD76		50	50	12.5	25	6.25	6.25	25	25
Pa ATCC 27853		50	50	25	50	12.5	50	25	50
Pa CHD80		25	50	25	50	25	25	25	50
Pa CHD81		50	50	25	50	50	50	50	50
Ef CHD30		6.25	6.25	3.13	1.56	12.5	12.5	6.25	6.25
Ef CHD31		12.5	12.5	1.56	1.56	12.5	12.5	6.25	12.5
Ss Ho94		1.56	1.56	0.78	0.78	1.56	1.56	1.56	1.56

¹ Ec—Escherichia coli, Kp—Klebsiella pneumoniae, Ecl—Enterobacter cloacae, Pm—Proteus mirabilis, Pa—Pseudomonas aeruginosa, Ef—Enterococcus faecalis, Ss—Staphylococcus saprophyticus.