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湖沼渠网型疫区，人口密集，居民血吸虫病感染率高；水田及相连沟渠钉螺面积大，活螺及感染螺密度均较高，血吸虫病严重流行。70～80年代，普遍采取灭螺和治疗粪阳病人、病牛为主的防治对策，部分地区可见效果，但在有大面积水田钉螺的湖沼渠网型地区则不显效果，不少乡镇（场
Lacustrine network type epidemic area, densely populated, high prevalence of schistosomiasis; paddy fields and associated ditch channel snail area, live snail and infection spiral density are high, schistosomiasis is a serious epidemic. In the 1970s and 1980s, measures for controlling snails and treating fecal-positive patients and disease-based cattle were generally adopted. Some areas showed effective results. However, lakes and marshes with large areas of snails had no significant effect in the drainage network area. Many townships ( field