US Centers for Disease Control and Prevention (CDC) — Pertussis (whooping cough) Japanese National Institute of Infectious Diseases This article is cited by Prior exposure to B. pertussis.

One of the genes regulated by PrfA is hyl, which encodes a toxin known as listeriolysin O (LLO), which allows the bacterium to escape vacuoles upon entry into a host cell. A second gene regulated by PrfA is actA, which encodes for a surface protein known as actin assembly-inducing protein (ActA).