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１９８８～１９９１年对全国３０个省（区、市）中７２６个县的１４７７７４２人进行的贾第虫感染调查，总感染率为２．５２％，呈全国性分布，以新疆（９．２６％）、西藏（８．２２％）和河南（７．１８％）为高，而吉林、辽宁、内蒙古等则甚低。人体感染率在２％以内的县占４９．８％，高于１０％的县仅占５．５％。年龄以５～９岁组（４．９７％）为最高，次之为１０～１４岁组（４．１７％）。男性（２．７９％）高于女性（２．５２％）。职业以牧民、儿童为高。新疆、广东、河北、四川、福建的感染有家庭聚集性。饮用水以涝坝水的感染率最高（１３．９４％）。
From 1988 to 1991, Giardia infection in 1,477,742 people in 726 counties of 30 provinces (autonomous regions and municipalities) in China was investigated. The total infection rate was 2.52%, with a national distribution. In Xinjiang (9.26% ), Tibet (8.22%) and Henan (7.18%), while Jilin, Liaoning and Inner Mongolia are very low. Counties with a prevalence rate of 2% or less account for 49.8% and those with a prevalence rate of more than 10% account for only 5.5%. The age group of 5-9 years (4.97%) was the highest, followed by the group of 10-14 years (4.17%). Men (2.79%) were higher than women (2.52%). Occupation to herders, children as high. Infection in Xinjiang, Guangdong, Hebei, Sichuan and Fujian has family agglomeration. Waterlogging dam water highest infection rate (13.94%).