TABLE 1.

Strains and plasmids used in this study

Strain or plasmid	Genotype/features	Source or reference
Strains
SL1344	hisG46 xyl rpsL	35
14028	Wild-type S. Typhimurium 14028	ATCC
ΔSPI1	SPI1::kan	32
ΔSPI2	SPI2::kan	36
SL1344 ΔphoP	phoP::kan	37
14028 ΔphoP	phoP::kan	This paper
Plasmids
pFPV-mCherry/2	mCherry constitutive expression	38
pMPMA3ΔPlac PprgH-gfp [LVA]	PprgH reporter (T3SS1)	32
pMPMA3ΔPlac PssaG-gfp	PssaG reporter (T3SS2)	32 and this paper
pMPMA3ΔPlac Pasr-gfp	Pasr reporter	This paper