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本文观察了斯氏狸殖吸虫第一中间宿主石门拟小豆螺的逐月密度分布和该吸虫的感染情况。1982年石门拟小豆螺全年逐月密度为41±23～156±99只/市尺~2:1982年10月至1983年4月,除12月未发现阳性螺外,其余各月斯氏狸殖吸虫在螺体的感染率为0.45％(0.20％～0.85％);感染度以雷蚴和尾蚴计,分别为2.4(2.0～3.5)和16.1(5.0～33.6),石门拟小豆螺体内还发现有与斯氏狸殖吸虫尾蚴极为类似的微形科吸虫尾蚴,感染率在0.20～1.52％之间,在计算前者感染率时,应注意排除。作者认为,以石门拟小豆螺作为斯氏狸殖吸虫第一中间宿主的地区,可在一年中任何季节进行调查,特别是冬春季蟹尚蛰伏不易捕获时,代之以查螺,以及时确定斯氏狸殖吸虫病疫源地。
In this paper, we observed the monthly density distribution and the infection status of Trichoplusia nihonius in the first intermediate host Shihmen. The annual density of Shimenao in 1982 was 41 ± 23 ~ 156 ± 99 / s ~ 2 from October 1982 to April 1983, except for the positive snails in December, The infection rate of genus Trichogramma was 0.45% (0.20% -0.85%) in spirochetes. The infection rates were 2.4 (2.0-3.5) and 16.1 (5.0-33.6), respectively, Also found to have very similar to the genus Microtus cercariae Microtus cercariae infection rate of 0.20 ~ 1.52%, in the calculation of the former infection rate, should be excluded. In the author’s opinion, the area of Shimenki snail as the first intermediate host of the genus Trichogramma could be investigated in any season of the year, especially when the winter and spring crabs are not easily trapped and replaced with snail Identify Schistosomallitoniasis foci.