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在中巨摩郡田富镇地区臼井沼的局部自然感染钉螺孳生地,一年间的钉螺(包括幼螺)自然感染率为3.9～4.7%。笔者等对该流行区中间宿主和保虫宿主感染血吸虫的机制及保虫宿主在流行病学上的作用进行了调查,这次进行了钉螺感染血吸虫的性别比例的调查。方法是:把从臼井沼采取的感染螺压碎,以一只螺获得的尾蚴分别感染一只小白鼠,20～25日后解剖,检查虫体的性别比例。从46只自然感染螺得到的尾蚴感染的46只小白鼠中,有37只(80.43%)阳性,其中雄虫单性寄生的16只(43.24%),雌虫单性寄生的17只(45.95%),雌雄两性寄生的4只(10.81%),即单性寄生的(90%)非常高,雌雄两性寄生的(10%)很低。该地域内,钉螺的血吸虫感染一般地说,一只钉螺被复数的血吸虫毛蚴侵入者少,大部份为一条毛蚴侵入。
Natural infection rates of Oncomelania snails, including young snails, ranged from 3.9 to 4.7% over a year in the naturally infected areas of Usui-maru in the area of Tate Fukushima in Gifu-gun. The author of the prevalence of intermediate host and host insecticidal infection of schistosomiasis host and insect protection hosts epidemiological role were investigated, this conducted a snail infection schistosomiasis sex ratio of the survey. The method is: crushing the infection thread taken from Usui Marsh, and infecting a mouse with cercariae obtained from a snail and dissecting it from 20 to 25 days to check the sex ratio of the parasites. Of the 46 white mice infected with cercariae naturally infected by snails, 37 (80.43%) were positive, of which 16 (43.24%) were uniparental and 17 (45.95 %), 4 (10.81%) were male and female parasitized, that is, uniparental parasitism (90%) was very high, and male and female parasitism (10%) was very low. In the area, snail schistosome infection in general, a snail is more than the number of schistosome invade Schistosome less, most of the invasion of a miracidia.