TABLE 1.

Effect of carvacrol and p-cymene on the motility of E. coli O157:H7 ATCC 43895 cells^a

Treatment during:	Essential oil component added	Concn of essential oil component (mM)	Motility classification
			Motile	Reduced motility	Nonmotile
Overnight incubation	Control	0	X
	Carvacrol	1			X
	p-Cymene	1	X
		10		X
Mid-exponential growth phase	Control	0	X
	Carvacrol	0.3		X
		0.5			X
		0.8			X
		1.0			X
	p-Cymene	0.3		X
		0.5			X
		0.8			X

^aCells were grown overnight in MHB in the presence of the substance or were treated in the exponential growth phase.