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The murine malaria parasite Plasmodium yoelii was killed in vitro when incubated with glucose and glucose oxidase, a system generating hydrogen peroxide, or with xanthine and xanthine oxidase, a system which produces the superoxide anion and subsequently other products of the oxidative burst. Catalase blocked the killing in both cases; superoxide dismutase and scavengers of hydroxyl radicals or singlet oxygen were ineffective in the xanthine oxidase system. Thus, hydrogen peroxide appears to be the main reactive oxygen species killing P. yoelii.
Dockrell et al. (Wed,) studied this question.