Suppose you perform a microarray experiment comparing RNA samples prepared from a bacterium isolated from the blood of an infected animal and grown in rich culture medium in vitro. You detect changes...

Suppose you perform a microarray experiment comparing RNA samples prepared from a bacterium isolated from the blood of an infected animal and grown in rich culture medium in vitro. You detect changes in the relative transcript amounts of several genes for the bacterium grown in blood versus culture medium. How do you interpret these results? What does it tell you about virulence of the bacterium?