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目的： 探索阳性螺点疫源性的规律，为制定有效的防治血吸虫病措施提供科学依据。方法： 选择大理市沙里木庄村一个有血吸虫感染钉螺存在的螺点（简称阳性螺点）进行连续４ 年的纵向观察。每次均通过随机环境抽样法设框进行螺情调查，并将所捕获钉螺全部解剖，检测钉螺自然感染率。结果： ４ 年中共查螺８ 次，均查到活螺，且螺点的位置、范围相对稳定，其中有６ 次查获感染性钉螺，钉螺的平均感染率为３．９％ （８６／２ １５７）。结论： 云南山区阳性螺点的位置、范围疫源性相对稳定。因此，消灭阳性螺点是防治血吸虫病的最佳措施。
Objective: To explore the law of positive nodulopathies and provide a scientific basis for effective measures to prevent and control schistosomiasis. Methods: A sandworm infected with Solenopsis spp. Existed in Shali Muzhuang Village, Dali City for longitudinal observation for 4 consecutive years. Each time through a random sample of environmental sampling box snail investigation, and the captured snails were all anatomized to detect snails natural infection rate. Results: In the past 4 years, the snails were found 8 times and the live snails were found. The location and range of the snails were relatively stable. Infectious snails were found 6 times, the average infection rate was 3.9% (86/2 157 ). Conclusion: The location of positive snail point in Yunnan mountainous area is relatively stable in foci of origin. Therefore, the elimination of positive spiral point is the best measure to prevent and treat schistosomiasis.