Table 1 Salmonella strains used in this study

Salmonella SL14028s

Wild-type pathogenic Salmonella typhimurium

ATCC

SL14028s AvrA-

SL14028s without AvrA

Constructed in our lab

SL1344

Wild-type Salmonella SL1344 strain

Hardt et al.,1997

SL1344 AvrA-

SL 1344 mutation without AvrA gene

Hardt et al.,1997

PhoP^C

Non-pathogenic complex regulator mutant derived from SL14028s

Miller et al., 1990