查明十二指肠钩虫和美洲钩虫两种虫种的地理分布,对合理选择驱虫药,消灭钩虫病具有重要意义。1975～1978年选择近几年未集体驱虫、以旱地作物为主的生产队为调查点,对一岁以上的居民采用饱和盐水漂浮法进行粪检,钩虫卵阳性者再作幼虫培养,鉴别虫种,计算其比例。12个县(市)4,008人的钩虫卵阳性率为14.3～73.1％,每克粪便孵出的幼虫数为 Identification of duodenal hookworm and hookworm two kinds of geographic distribution of insects, the rational choice of deworming drugs, elimination of hookworm disease is of great significance. From 1975 to 1978, we selected the production team that did not have the collective deworming in recent years, and took the dryland crop as the main production team as the investigation point. The residents above the age of one were screened by the saturated salt water floating method, Identification of species of insects, calculate the ratio. The positive rate of hookworm eggs from 4,008 in 12 counties (cities) was 14.3-73.1%. The number of larvae per gram of stool was