Results Changes in S. Typhimurium gene expression after chromosomal insertion of tviA In S. Typhi , TviA-regulated genes have been identified and encompass the flagella regulon and genes encoding T3SS-1 [ 8 ] .
To determine how TviA affects gene expression in a non-typhoidal serotype , the tviA gene was introduced into the S. Typhimurium chromosome and the gene expression profile compared to a published gene expression profile of TviA-regulated genes in S. Typhi [ 8 ] .