TABLE 1.

Bacterial strains used in this study

Bacterial strain	Description and/or genotype	Source or reference
S. enterica
Sal 18	S. enterica serovar Enteritidis wild type	47
LS 21	Sal 18, ΔSPI-1::cat	This study
LS 22	Sal 18, ΔinvG::cat	This study
LS 29	Sal 18, att Tn7::tet	Unpublished data
LS 25	Sal 18, att Tn7::cat	Unpublished data
E. coli DH5α	F− φ80dlacZΔM15 Δ(lacZYA-argF)U169 deoR recA1 endA1 hsdR17(rK− mK−) phoA supE44 λ−thi-1 gyrA96 relA1	Invitrogen