云南血吸虫病流行以坝区为重〔1〕。近年来 ,由于在重疫区连续实施人畜同步化疗 ,辅以易感环境灭螺的防治措施 ,疫情普遍下降 ,坝区防治效果明显优于山区〔2〕 。洱源县永联村是我省典型的平坝型重疫区 ,该村自 1992年起开展全面系统的防治 ,资料登统记录全面 ,保全完整。为反? Yunnan schistosomiasis epidemic to the dam area as the most important (1). In recent years, due to the continuous implementation of human and animal husbandry concurrent chemotherapy in the heavy endemic area, combined with the prevention and control measures of susceptible environmental snail, the epidemic generally declined, the dam area control effect is obviously superior to the mountainous area 〔2〕. Eryuan County Yonglian Village is a typical Pingba type heavy epidemic area in our province. Since 1992, the village has conducted a comprehensive and systematic prevention and treatment. The information has been recorded in a comprehensive and complete manner. For the opposite?