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。
Protozoan parasites of the phylum Apicomplexa include some of the most important causative agents of human and animal diseases, in particular, malaria.
疟原虫是引起疟疾的原生动物；是疾病的病原体。
Plasmodium is a protozoan which causes malaria; it is the causative agent of the disease.
水中有病毒、 细菌、 原生动物、蠕虫等多种病原体。
The pathogen in the waters are viruses, bacteria, protozoa and helminths.
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