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螺宿主的血吸虫感染率随螺龄而变化,而两者的关系即螺龄-感染率曲线则极为复杂,且随空间、时间及血吸虫-螺宿主种类而异。本文分析了来自津巴布韦感染埃及血吸虫的球形小泡螺(Bulinus globosus)和圣路西亚感染曼氏血吸虫的光滑双脐螺(BiomPhalaria glabrat)等现场资料作为主要分析对象,并发展了Muench催化模型的离散时间模式。将津巴布韦资料得出的生命关系曲线和流行病学参数进行了拟合试验,试图以基础流行病学概念解释观察结果。用以上两组资料绘图,得到了两种类型的曲线。一种是感染
The infection rate of Schistosoma japonicum varies with the age of spirochete, and the relationship between them, ie, the age-susceptibility curve, is very complicated and varies with space, time and the type of schistosome-spirochaete host. In this paper, the field data of Bulinus globosus infected with Schistosoma japonicum in Zimbabwe and BiomPlalaria glabrat infected with Schistosoma mansoni in St. Lucia were analyzed as main analysis objects and the discreteness of Muench catalytic model was developed Time mode. Fitting the life-relation curve and epidemiological parameters derived from Zimbabwe data, the experiment was attempted to explain the observation based on the basic epidemiological concept. Drawing on the above two sets of data, two types of curves are obtained. One is infection