贾第虫 (Ｇｉａｒｄｉａ)是一种鞭毛虫 ,由列文·虎克(Ｌｅｅｕｗｅｎｈｏｅｋ)发现于 16 81年 ,作为人类一种重要的病原体 ,贾第虫直至最近 4 0年才被认识〔1〕。贾第虫目前发现存在于 4 0多种动物体内 ,虽然它的分类还存在争议 ,但多数学者认为贾第虫分为三大类。其中的蓝氏 Giardia, a flagellate, was discovered by Leeuwenhoek in 1681 as an important human pathogen, and Giardia was not recognized until the late 40s [1]. Giardia is currently found in more than 40 species of animals, although its classification is still controversial, but most scholars believe that Giardia is divided into three categories. One of Blue’s