For example, the Ustilago maydis fungal effector Pep1, contributes to the penetration of the host epidermis by inhibiting apoplastic plant peroxidases (Hemetsberger et al., 2012), while the Phytophthora sojae effector CRN 115 decrease H2O2 accumulation during infection through interaction with plant catalases (Zhang et al., 2015). Here, CAT is linked to infection.