Carey A B
Am J Trop Med Hyg. 1979 Jul;28(4):750-5.
Identification of foci of vector-borne diseases does not require knowledge of exact abundances of vectors and pathogens; rather, a focus is defined by the presence, or some minimal level of abundance, of a vector and pathogen. Stepwise discriminant analysis (DA) was applied to data on free-ranging adult wood ticks (the vector) and to data on isolations of Colorado tick fever virus from small mammals. Trap stations were grouped on the basis of relative abundance of wood ticks for one set of analyses and on the presence or absence of virus for another set of analyses. Additional data consisted of easily measured environmental variables. It is concluded that DA provides a useful tool for analysis of ecosystem structure and an effective means of identifying foci of infection.
确定媒介传播疾病的疫源地并不需要了解媒介和病原体的确切数量；相反，疫源地是由媒介和病原体的存在或某种最低数量水平来定义的。逐步判别分析（DA）被应用于自由放养的成年木蜱（媒介）的数据以及从小型哺乳动物中分离出的科罗拉多蜱传热病毒的数据。在一组分析中，诱捕站根据木蜱的相对数量进行分组，而在另一组分析中，则根据病毒的有无进行分组。其他数据包括易于测量的环境变量。得出结论认为，判别分析为生态系统结构分析提供了一个有用的工具，也是识别感染疫源地的有效手段。
