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大凉山区位于四川省南部,横断山脉东缘,气候垂直变化明显,河谷为亚热带,山腰为温带,山原为寒带。血吸虫病分布於河谷亚热带地区,受地貌和垂直气候的影响呈现有规律的变化。在狭窄燥谷地区血吸虫病只在水源充足地方流行,呈不连续分布。在亚热带宽广河谷呈大面积连续分布,在这些分布地区四周随着海拔高度的增加,血吸虫病感染率逐渐下降。其流行区与非流行区的临界温度线大约为15.5℃左右。采用年平均气温多元回归方程可以确定大山区血吸虫病流行区的性质和范围。
Daliangshan District is located in the southern part of Sichuan Province, the eastern edge of the Hengduan Mountains, with obvious vertical changes in the climate. The valley is subtropical, the mountainside is temperate, and the mountain is the frigid zone. Schistosomiasis is located in the subtropical valley, showing regular changes under the influence of landform and vertical climate. In the narrow dry valley schistosomiasis prevalence in the water sufficient place, was discontinuous distribution. In a wide area of subtropical wide valleys of continuous distribution, in these regions around the distribution of altitude with the increase of schistosomiasis infection rate decreased. The prevailing and non-endemic areas of the critical temperature line is about 15.5 ℃. Using the multiple regression equation of annual mean temperature can determine the nature and extent of schistosomiasis endemic areas in mountainous areas.