CAT and infection: Peroxidase/catalase (FTS_1471, KatG) is connected to resistance of Francisella against reactive oxygen species (Lindgren et al., 2007), it is secreted into culture media (Konecna et al., 2010) and into macrophages during infection where it restricts macrophage signaling and cytokine production (Melillo et al., 2010).