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１９８７－１９９０年，天津市按照全国人体寄生虫分布调查实施细则的方法，对市辖５个县进行了抽样调查，共查见寄生虫１３种，其中原虫６种，蠕虫７种。总感染率为３８．６％。各种寄生虫感染分别为：蛔虫２８．３％、鞭虫６．９％、蛲虫１５．３％、钩虫０．４％、华支睾吸虫０．２％、溶组织内阿米巴１．７％、结肠内阿米巴２．３％、哈氏内阿米巴０．２％、微小内蜒阿米巴０．９％、布氏嗜碘阿米巴０．３％和贾第虫１．７％。除蛔虫感染率女性高于男性（χ２＝１０．８５，Ｐ＜０．００１）、贾第虫男性高于女性（χ２＝６．０４，Ｐ＜０．０１）外，其他虫种性别间的差别无显著意义。
From 1987 to 1990, Tianjin City conducted a sample survey of 5 counties under the jurisdiction of the city in accordance with the National Implementation Rules for Investigation of Parasite Distribution. A total of 13 parasites were investigated, including 6 species of protozoa and 7 species of worms. The overall infection rate was 38.6%. Various parasite infections were as follows: aphids 28.3%, whipworm 6.9%, aphids 15.3%, hookworms 0.4%, Clonorchis sinensis 0.2%, Entamoeba histolytica 1 7%, 2.3% of Entamoeba histolytica, 0.2% of Entamoeba hispidae, 0.9% of Micromandarin amoeba, 0.3% of Hemia aethioae Insects 1.7%. In addition to the female locust infection rate higher than males (χ2=10.85, P<0.001), Giardia males were higher than females (χ2=6.04, P<0.01), among other insect species The difference is not significant.