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贾第虫于1681年由 Van Leeuwenhoch 首先发现以来已有300年历史了。尽管对兰氏贾第虫的命名至今尚未统一,但现已普遍认为寄生在人体的贾第虫属于肠贾第虫(Giardia intesti-nalis)。近年来大量证据表明这是具有致病性的肠道原虫:①腹泻病人中该虫的检出率高于无肠病者;②带虫者的腹泻发生率高于非带虫者;③吞食贾第虫包囊可导致腹泻;④抗贾第虫化疗可使腹泻和贾第虫均消失。目前一致公认贾第虫病是世界性分布最常见的肠道原虫病之一,其感染率据世界卫生组织估计为1～20％,与各地的卫生条件密切有关,在有的人群中可高达50～70％,甚至100％。60年代和70年代在地中海地区、智利、意大利、苏联和美国均发生过较大规模
Giardia was first discovered 300 years ago by Van Leeuwenhoch in 1681. Although the nomenclature of Giardia lamblia has not been unified so far, it is now generally accepted that Giardia parasites in humans belong to Giardia intesti-nalis. In recent years, a large body of evidence indicates that this is a pathogenic enteric protozoal: ① the detection rate of diarrhea in patients with the worm is higher than those without enteropathy; ② parasites were higher than non-parasites diarrhea; swallow Giardia cyst can cause diarrhea; ④ anti-Giardia chemotherapy can diarrhea and Giardia disappear. Currently, it is universally acknowledged that giardiasis is one of the most common intestinal protozoal diseases in the world. Its infection rate is estimated to be 1 to 20% by the World Health Organization (WHO), which is closely related to the sanitary conditions in various places. In some people, Up to 50 ~ 70%, or even 100%. In the 1960s and 1970s in the Mediterranean region, Chile, Italy, the Soviet Union and the United States