Decomposes hydrogen peroxide into water and oxygen; serves to protect cells from the toxic effects of hydrogen peroxide. Involved in resistance to paraquat when fur is absent and to tert-butyl hydroperoxide. Is important for survival under glucose starvation and desiccation conditions. Not required for virulence although is necessary for nasal colonization. 2 H2O2 = 2 H2O + O2 Homodimer. Induced by hypochlorous acid. Positively regulated by the ferric uptake regulator (fur), in a Fe(2+) dependent manner. Negatively regulated by PerR. Belongs to the catalase family.