Destroys radicals which are normally produced within the cells and which are toxic to biological systems. May act in the parasite defense by neutralizing superoxide generated by activated leukocytes, thus acting as both an antioxidant and an anti-inflammatory factor. 2 H(+) + 2 superoxide = H2O2 + O2 Binds 1 copper ion per subunit. Binds 1 zinc ion per subunit. Belongs to the Cu-Zn superoxide dismutase family.