Protozoan parasites of the phylum Apicomplexa include some of the most important causative agents of human and animal diseases, in particular, malaria.
顶复门类的原生动物寄生虫包括造成一些最重要人类和动物疾病的病原体，特别是疟疾。
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The discovery that an organelle found inside parasites of this phylum probably stems from a plastid of plant origin has stimulated research on the effect of chemical herbicidal agents on Apicomplexa.