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近年来，对湖沼、山丘型流行区居民血吸虫再感染作了大量研究。云南省对血吸虫再感染仅在平坝型流行区作过观察，现对高原峡谷型流行区的永胜县阳禾村居民经一个感染季节（4－10月）后血吸虫再感染情况进行观察。材料和方法1武区概况阳禾行政村为一高原峡谷型地带，谷底有一条?
In recent years, a large number of researches have been done on the re-infection of schistosoma japonicum among lakes and mountainous endemic areas. Re-infection of schistosomiasis in Yunnan Province was only observed in endemic areas of Pingba. Residents of Yanghe Village in Yongsheng County of Yongsheng County in the plateau of the plateau were re-infected with Schistosoma japonicum after one infection season (April-October). Materials and methods 1 Wu area overview Yang He administrative village is a plateau canyon type valley, the bottom of a?