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| 日本血吸虫毛蚴对不同密度和距离湖北钉螺易感性的初步实验观察 |
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汪 伟1,2, 李洪军1,2, 李幼子1,2, 邢云天1,2, 曲国立1,2, 魏剑英1,2, 戴建荣1,2, 梁幼生1,2
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1.江苏省血吸虫病防治研究所;2.卫生部寄生虫病预防与控制技术重点实验室
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| 摘要: |
| 为探讨日本血吸虫(Schistosoma japonicum)毛蚴对不同密度、不同距离湖北钉螺(Oncomelania hupensis)易感性, 在现场环境下, 采用20 000 条新鲜孵化出的日本血吸虫毛蚴分别感染1、2、3、5 m处的湖北钉螺, 每处钉螺分为5、10、50、100 只/袋4 个密度组, 感染4 h 后带回实验室饲养, 8 周后解剖观察钉螺感染情况。结果发现, 距离1、2、3、5 m, 密度5、10、50、100 只/袋4 个组钉螺感染率分别为7.06%、4.35%、2.47%和1.23%; 4.55%、4.44%、4.11%和2.27%; 2.62%、1.58%、1.29%和1.1%;2.36%、4.04%、2.73%和1.5%。研究表明, 钉螺感染概率与距毛蚴投放的距离成反比; 但是, 未得出钉螺感染率与钉螺密度之间的线性关系。 |
| 关键词: 日本血吸虫(Schistosoma japonicum) 湖北钉螺(Oncomelania hupensis) 毛蚴 密度 距离 |
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| 基金项目:国家自然科学基金(81071379); 国家科技支撑计划(2009BAI78B06); 江苏省卫生厅项目(200701、200901) |
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| Susceptibility of Schistosoma japonicum miracidium to Oncomelania hupensis snails at different densities and distances: a primilinary experimental observation |
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| Abstract: |
| To investigate the susceptibility of Oncomelania hupensis at different densities and to miracidium of Schistosoma japonicum, snails at 1, 2, 3 and 5 m, each with densities of 5, 10, 50 and 100 per package were infected with 20 000 freshly hatched miracidia in the field, and transferred to laboratory 4 h post-infection. All snails were dissected for infection eight weeks later. At sites of 1, 2, 3 and 5 m, the infection rates of snails were 7.06%, 4.35%, 2.47% and 1.23%, 4.55%, 4.44%, 4.11% and 2.27%, 2.62%, 1.58%, 1.29% and 1.1%, 2.36%, 4.04%, 2.73% and 1.5%, respectively for snail densities of 5, 10, 50 and 100 per package. It is indicated that the infection rates of snails are inversely proportional to the distances from the miracidium-disposal sites, but no linear relation between snail infection rate and snail density. |
| Key words: Schistosoma japonicum Oncomelania hupensis miracidium density distance |