Flagellin of Salmonella is highly immunogenic and is a key protein recognized by the host immune system.
SPI-1 inducing condition increases the secretion but not the expression level of FljB.
SPI-2 inducing condition shut down the expression and consequential secretion of FljB.
Salmonella may subvert the host's innate immune system through regulation of the expression and secretion of Flagellin.