CAT and infection: A similar pattern was observed for the invasion activator hilA. The expression of the katG catalase is not dependent on ArcB, but sodC is strongly repressed in the cells must find an equilibrium between entrance or required solutes and expulsion of toxic compounds into the cells but also being able to secrete them, explaining the dynamics observed in the expression of ompD, ompC and ompF, associated with passive diffusion of nutrients and small molecules, that would also have a potential role as antigens during infection.