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medical protozoan
医学原虫
以单细胞形式生活的生物。整个机体虽由一个细胞构成,但具有生命活动的全部生理功能,如摄食、代谢、呼吸、排泄、运动及生殖等。包括寄生在人体腔道、体液、组织或细胞内的致病及非致病性原虫,有40余种。有些原虫如疟原虫、利什曼原虫、锥虫、溶组织内阿米巴可以引起热带病,对人类造成严重危害;一些机会性致病原虫,如刚地弓形虫、隐孢子虫、蓝氏贾第鞭毛虫等,也日益受到重视。
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