TABLE 1.

Phenotypic characteristics of high-pathogenicity and low-pathogenicity strains of S. Enteritidis used in this study^a

Group	Strain	Phage type	MLVA typeb	Caco-2 cell invasiveness	Survival or growth characteristic by condition				Motility	Biofilm
					Avian macrophages	Acidic stress (pH 2.6)	Oxidative stress	Egg albumen
LP	C19	PT13	11	Low	Low	Low	Low	No growth	Low	Negative
	C45	PT13	11	Low	Low	Low	Low	No growth	Low	Negative
	G45	PT13a	4a	Low	Low	Low	Low	Growth	Low	Negative
HP	G1	PT4	13a	Medium	High	High	High	Growth	High	Positive
	UK	PT4	13a	High	High	High	High	Growth	High	Positive
	BC8	PT8	9a	High	High	High	High	Growth	High	Mixedc

^aSee references 19 and 21. For each category, “low” indicates that the difference is statistically significant (P < 0.05) in comparison with “high.”

^bMLVA, multilocus variable-number tandem-repeat analysis.

^cMixed, this strain has a mixed subpopulation of both biofilm-positive and -negative cells.